Number Theory

If a number is divisible by 23, multiply the last digit of the given number to 7 and add the remaining number. Repeat the steps if necessary.

• True
• False

Given: 22 = 4 = 32 (mod ___), what must be the value of the unknown?

• 26
• 28
• 22
• 24

4199 is divisible by 19.

• True
• False

-74 mod 8 = ?

• 8
• 6
• 7
• 5

Find TWO common multiples of the given numbers: 4 and 5

• 20 and 30
• 10 and 20
• 15 and 40
• 20 and 40

The following are the numbers you can multiply to produce the fundamental theorem of arithmetic, EXCEPT:

• 53, 59, 61, 67, 71, 73
• 3, 5, 7, 11, 13, 17
• 31, 37, 41, 43, 47, 49, 51
• 3, 37, 61, 71, 73

Complete the expression =E2=80=98 __13 = 1,594,323 = 819 (mod 1584)=E2=80=99.

• 7
• 2
• 3
• 5

Which of the following numbers below is the LCM of 7 and 10?

• 7
• 140
• 28
• 70

-60 mod 3 = ?

Complete the expression '53 = 125 = 14 (mod ___ )'

• 37

Find the Least Common Multiple: 10, 12 and 15

• 60
• 45
• 70
• 65

The missing value of the expression 39 = 19 683 = 6 (mod __).

• 5
• 9
• 3
• 7

Find the Greatest Common Divisor. Apply any method: 125 and 275

• 25
• 10
• 15
• 5

The following are the other quadratic residues of modulo 28, EXCEPT:

• 4
• 8
• 1
• 13

All numbers are divisible by 1.

• True
• False

Which of the following are the prime factors of 3024?

• 24 x 32
• 7 x 8 x 9 x 12
• 7 x 24 x 33
• 6 x 7 x 8 x 9

Three of the numbers below are divisible by 13, 15 and 17. Which is NOT?

• 29,835
• 33,150
• 48,645
• 62, 985

Using the formula of Mersenne prime 2k =E2=80=93 1, if k = 11, the value is

• 2,048
• 2,047
• 2,046
• 2,049

1890 is divisible by 3.

• True
• False

The following are the divisors of 60, EXCEPT:

• 12
• 18
• 15
• 3

If the last two digits of a number are divisible by 4, then that number is a multiple of 4 and is divisible by 4 completely.

• True
• False

Using s = 2, in the Fermat formula 2s + 1, is the answer a Fermat number?

• Maybe
• No answer
• No
• Yes

The LCM of 2, 3, and 6 is _______.

• 8
• 12
• 2
• 6

Which of the following is a prime number?

• 1
• 221
• 101
• 201

The following are the quadratic residue of modulo 28 , EXCEPT

• 10
• 8
• 9
• 4

Write all the multiples of 7 between 5 and 50.

• 7, 15, 24, 28, 32, 38, 46
• 7, 14, 22, 26, 36,43, 49
• 7, 14, 21, 28, 35, 42, 49
• 7, 13, 18, 27, 35, 42, 48

Find the Least Common Multiple: 2 and 3

• 16
• 6
• 9
• 10

Which of the following numbers below is the answer to 43 modulo 5?

• 5
• 8
• 3
• 7

What must be the value of g, in the formula 2g =E2=80=93 1 = 8 191, to make it correct?

• 11
• 17
• 13
• 7

If a number is divisible by 37, multiply 11 to the last digit minus the remaining number. Repeat the steps if necessary.

• True
• False

Find TWO common multiples of the given numbers: 3 and 4

• 12 and 16
• 8 and 12
• 12 and 24
• 15 and 21

Which of the following pairs of numbers has a remainder of 13?

• 1,865 and 495
• 12,865 and 595
• 5 126 and 1 512
• 650 and 273

The following are the factors of 72, EXCEPT:

• 12
• 8
• 6
• 23

What must be the last digit of a number to make it divisible by 10?

The factors of 30 in the factor tree are

• 5 and 6
• 3 and 7
• 6 and 2
• 4 and 5

The value of p in the expression 2p =E2=80=93 1 = 524 287 is ______.

• 29
• 21
• 17
• 19

Which of the following form shows a power function?

• f(x) = 2xk
• f(x) = -3xk
• f(x) = 3xk
• f(x) = -xk

83 mod 7 = ?

• 3
• 9
• 6
• 7

Which of the following numbers is divisible by 47?

• 11,549
• 12,549
• 10,549
• 9,549

Which of the following is a coprime of 385?

• Non of the choices
• 7
• 3
• 5

What is the product of the prime factors 2,2 and 53?

• 106
• 49
• 57
• 212

The greatest common divisor of 19,342 and 2,766 is ______.

• 3
• 2
• 6
• 8

Which of the following pairs of numbers has a remainder of 5?

• 16, 476 and 636
• 18, 477 and 838
• 16, 475 and 643
• 13 865 and 495

Complete the expression =E2=80=9953 = 125 = 14 (mod ___ )=E2=80=99

• 33
• 37
• 38
• 43

Double the last digit of the given number and subtract it from the remaining number excluding the last digit. This rule applies in

• Divisibility by 4
• Divisibility by 7
• Divisibility by 3
• Divisibility by 11

The following pairs of numbers has a GCD of 31, EXCEPT:

• 6750 & 1519
• 2573 & 2759
• None of the choices
• 1519 & 2573

Find the Greatest Common Divisor: 352 and 41

• 1
• irregularly prime
• coprime
• 2

-35 mod 7 = ?

Which of the following expressions is correct?

What is the remainder if we use Euclidean Algorithm between 55, 230 and 3, 985?

What must be the missing value of the expression to make it ? 76 = 117 649 = ___ (mod 3)

• 1

Complete the statement: 252 = 625 = ___ (mod 28).

• 11
• 9
• 7
• 5

24 mod 3 = ?

If we substitute 7 for s, from the formula 2s + 1, then the answer is ____. Is the answer a Fermat number?

• Maybe
• No answer
• No
• Yes

Complete the mathematical statement: 142 = ____ = 0 (mod 28)

• 189
• 169
• 144
• 196

4199 is divisible by 13.

• True
• False

The symbol sigma is used to determine the sum of the given objects.

• True
• False

All numbers are coprime of 385, EXCEPT:

• 3
• 13
• 5
• 2

What must be the value of the unknown if, 182 = 324 = ___ (mod 27)?

The numbers 2, 2, 2, 3, 3, 5, 7, and 11 are the factors of what number?

• 27,720
• 20,720
• 22,720
• 21,720

Which of the following is the prime factorization of 328?

• 23 x 41
• 33 x 41
• 22 x 41
• 32 x 41

The modulo of a certain number is obtained by

• addition
• division
• multiplication
• subtraction

75 mod 6 = ?

• 5
• 2
• 3
• 1

Find the Greatest Common Divisor: 210 and 320

• 10
• 5
• 2
• 20

Which of the following are the prime factors of 234?

• 2 x 3 x 132
• 2 x 3 x 13
• 22 x 3 x 13
• 2 x 32 x 13

Listed below are three numbers that are composite. Which is not?

• 681
• 878
• 577
• 785

Which of the following pairs of numbers below have the LEAST number of common multiples from 1 to 30?

• 3 and 5
• 2 and 3
• 2 and 5
• 4 and 5

The prime factors of 420 are 2, 3, 5 and ____.

• 13
• 7
• 19
• 11

Which of the following is the way to write the set notation of factors of 56?

• {1, 2, 4, 7, 8, 14, 28, 56}

25 mod 5 = ?

Write all the multiples of 8 between 3 and 100.

• 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96
• 8, 16, 24, 32, 40, 48, 54, 64, 72, 80, 88, 96
• 8, 16, 24, 32, 40, 48, 54, 63, 72, 80, 88, 96
• 8, 16, 24, 32, 40, 46, 56, 64, 72, 80, 88, 97

Find the Greatest Common Divisor. Apply any method: 78 and 96

• 2
• 6
• 3
• 4

If the integers 5, 3, -4, 7, -10, 8, and -5 are arranged in order from least to greatest which integer would come first in the list.

• 8
• 3
• -10
• -4

The largest factor of 279 is

• 23
• 31
• 29
• 19

The solution of the statement 231 =E2=80=93 1 = ____.

• 2 147 483 646
• 2 147 483 648
• 2 147 483 647
• 2 147 483 649

Using Euclidean Algorithm, determine the remainder of 703 and 259

• 20
• 23
• 37
• 15

Using Prime Factorization, what is the value of 23 x 32 x 5 x 11?

• 2850
• 3570
• 3960
• 4130

Find the Greatest Common Divisor: 469 and 357

• 3
• 9
• 14
• 7

What must be the value of the missing value of the expression 213 = 8 192 = 2 (mod __ ) to make it correct?

• 11
• 7
• 5
• 9

Which of the following is the quadratic non residue of modulo 28?

• 13
• 16
• 20
• 18

The numbers below are coprime, EXCEPT:

• 23 and 54
• 3 and 42
• 1 and 27
• 100 and 99

Which of the following pairs of numbers has a remainder of 2?

• 5 126 and 1 512
• 756 and 272
• 13 865 and 495
• 603 and 359

Using Euclidean Algorithm, determine the remainder of 18476 and 2636

• 4
• 10
• 23
• 15

Which of the following is a coprime of 483?

• 5
• 7
• 3
• 21

Find the Greatest Common Divisor. Apply any method: 500, 600 and 700

• 150
• 50
• 10
• 100

Find the Greatest Common Divisor: 420 and 315

• 105
• 10
• 15
• 20

The factors of 355 are ____ numbers.

• 4
• 2
• 5
• 3

The factors of 14 in the factor tree are 7 and ____.

• 3
• 4
• 2
• 5

The GCD of 90 and 105 is ________.

• 3
• 5
• 18
• 15

The factors of 300 are the prime numbers 2, 3 and 5. Which of the following numbers appears twice?

• 2 and 3
• 2 and 5
• 2, 3 and 5
• 3 and 5

The _____________ is the modulo of a certain number.

• remainder
• sum
• difference
• product

4199 is divisible by 23.

• True
• False

The following are the multiples of 12 between 120 and 450, EXCEPT?

• 270
• 432
• 362
• 182

IF a number is divisible by _________, multiply 3 to the last digit then add the remaining number Repeat the steps if necessary This rule applies in

• Divisibility of 29

The primitive root of mod 60 using 11 as one of the primitive roots is

• 1
• 11
• 3
• 2

Find the Least Common Multiple: 2 and 7

• 35
• 21
• 14
• 10

Find the Greatest Common Divisor. Apply any method: 899 and 760

• prime
• 6
• relatively prime or coprime
• 8

In mod 33, using 2, 3, and 5 as coprimes and base 5, the primitive roots are 8, ____, and ____.

• 21 and 23
• 23 and 25
• 25 and 26
• 23 and 26

Find the Least Common Multiple: 6 and 14

• 56
• 42
• 49
• 28

The following are the multiples of 2, 3, and 7, EXCEPT:

• 72
• 126
• 42
• 21

The following are the primitive roots of mod 50 base 2, EXCEPT:

• 12
• 5
• 14
• 28

The factors of 12 from the given factor tree are 3 and ____.

• 2
• 4
• 3
• 6

Which expression has the greatest value?

• 3 + (-2)
• (-3+4) (-1)
• -3 + 3
• 3 + (-4)

What is the remainder if you apply the Euclidean Algorithm to 10 465 and 3 553?

• 3
• 2
• 0
• 1

What must be the value of the unknown if, ___ = 64 = 10 (mod 27)?

• 83
• 43
• 26
• 82

The primitive root of mod 60 using 11 as one of the primitive root is

• 4
• 7
• 11
• 2

Using Euclidean Algorithm, determine the remainder of 1541 and 897

• 23
• 15
• 37
• 20

Using Euclidean Algorithm, determine the remainder of 8 420 and 3 020

• 23
• 20
• 17
• 7

The factors of 270 with the most times repeated is

• 3
• 7
• 5
• 2

All of the numbers below have an answer of 4, EXCEPT:

• 95 mod 7
• 76 mod 9
• 64 mod 6
• 73 mod 8

Find the Greatest Common Divisor. Apply any method: 4250 and 2530

• 15
• 30
• 5
• 10

Complete the expression =E2=80=98 __13 = 1,594,323 = 819 (mod 1584)=E2=80=99

• 5
• 2
• 4
• 3

Which solution is from the given factor tree below?

• i and ii

Find the Least Common Multiple: 3 and 7

• 28
• 18
• 35
• 21

The expressions below have a solution of 10.

• 78 mod 17
• 45 mod 23
• 72 mod 15
• 33 mod 21

Which of the following is the correct way to write the set notation of factors of 56?

• {56, 28, 14, 8, 7, 4, 2, 1}
• {1, 2, 4, 7, 8, 14, 28, 56}
• {1, 56, 2, 28, 4, 14, 7, 8}
• {56, 27, 14, 9, 7, 3, 2, 1}

Complete the mathematical statement: 22^2 = ____ = 25 (mod 27).

• 484
• 361
• 400
• 441

What is the value of 216 + 1? Is it a Fermat Number?

• 65, 537 No, it is not a Fermat Number
• 65, 536 No, it is not a Fermat Number
• 65, 536 Yes, it is a Fermat Number
• 65, 537 Yes, it is a Fermat Number

In finding the answer in 59 mod 5, the usual last step of congruence modulo is

• The remainder is the answer
• Divide 59 and 5
• Multiply the whole number to 5
• Subtract the product to the first whole number

If you substitute a negative integer to the exponent of a power function, then the answer is _____________.

• singularity
• symmetry
• none of the choices
• anti-symmetry

Find the Greatest Common Divisor: 77 and 121

• 21
• 11
• 1
• 22

If you obtain the factors of 444, the largest prime number is

• 23
• 11
• 37
• 3

Find the Greatest Common Divisor: 624 and 516

• 12
• 2
• 3
• 9

From the given numbers below, _______ is the coprime of 143.

• None of the choices
• 13
• 19
• 11

Which among the numbers below is equal to 38 mod 9?

• 4
• 2
• 3
• 7

What is the primitive root of mod 75 using 7 as one of its coprime?

• 43
• 16
• 37
• 25

Johnny borrowed money from his brother 10 months ago. He returned Php 1000.00 per month to his brother starting the month he borrowed the money. Currently, he owes his brother Php 5,000.00. How much money did he borrow from his brother?

• Php 20,000
• Php 15,000
• Php 10,000
• Php 12,000

If k is less than 0 where k is not an integer, then f(0) is undefined and it has no y-intercepts.

• True
• False

Find the Greatest Common Divisor: 265 and 190

• 25
• 5
• 15
• 10

What must be the value of the unknown if, 112 = 121 = ___ (mod 28)?

• 10
• 12
• 9
• 11

What must be the missing value of the expression to make it correct? 76 = 117 649 = ___ (mod 3)

• 3
• 1
• 0
• 2

Base on the given factor tree, what numbers should be written inside the boxes?

• 2 and 3
• 3 and 5
• 3 and 4
• 2 and 2

Which of the following operations results in a difference?

• Division
• Addition
• Multiplication
• Subtraction

How many factors does 421 have?

• 2
• 3
• 4
• 5

Find the Least Common Multiple: 3 and 11

• 44
• 22
• 33
• 55

-94 mod ____ = 8

• 15
• 17
• 12
• 13

What is the primitive root of mod 75 using 7 as one of its coprimes?

• 25
• 43
• 33
• 37

How many divisors does 12 have?

• 8
• 4
• 6
• 10

A Fermat Number is a prime number that follows the form of 2s + 1.

• True
• False

What must be the value of the last digit of 3, 45__ to make it divisible by 8?

• 0
• 6
• 16
• 8

Write all the multiples of 17 between 70 and 160.

• 85, 102, 119, 136, 153
• 85, 102, 119, 135, 153
• 85, 104, 119, 138, 153
• 85, 103, 119, 137, 153

Which of the following is the LCM of 12 and 15?

• 120
• 90
• 60
• 240

The primitive roots of mod 55 using coprimes 5, 7, and 11 using base 3 are 23, 42, and ____.

• 45
• 49
• 47
• 51

Which of the following is the solution of the expression 23 x 52 x 7?

• 2400
• 1400
• 1700
• 2100

Find the Greatest Common Divisor: 138 and 224

• 3
• 1
• 4
• 2

Find the Least Common Multiple: 4, 8 and 10

• 65
• 30
• 40
• 60

What is the remainder of 23 069 and 20 069 when you use the Euclidean Algorithm?

• 3
• 1
• 0
• 2

The expressions below have a solution of 12, EXCEPT:

• 78 mod 17
• 47 mod 35
• 33 mod 21
• 72 mod 15

Which of the following is the correct way to find the prime factorization of 24?

• ii only
• None of the choices
• both i and ii
• i only

The number with the most numbers of multiples between 5 and 35 below is _________.

• 8
• 6
• 4
• 7

The following are the quadratic residue of modulo 27 , EXCEPT

• 8
• 7
• 3
• 4

The following are the quadratic non residue of modulo 28, EXCEPT

• 25
• 23
• 22
• 24

From the given numbers, which number has more number of factors?

• 25
• 45
• 15
• 30

Which of the following expressions is below is correct?

• 25 mod 4 = 2
• 22 mod 6 = 2
• 24 mod 7 = 4
• 23 mod 5 = 3

The factors of the number is 25 x 32 x 37. What is the number?

• 7,104
• 5,787
• 5,328
• 10,656

The rules in obtaining the divisibility of 3 is

• If a number starts 3, 6, or 9
• If a number ends in 3, 6 or 9
• If the last two digits of the given number is divisible by 3
• Add all the digits of the given number

Which of the following is the first step to find the answer in 59 mod 5?

• Multiply the whole number to 5
• The remainder is the answer
• Divide 59 and 5
• Subtract the product to the first whole number

Complete the expression '27 = 128 = ___ (mod 63)'

• 2

Which of the following numbers that can be presented using exponents in factorization?

• 8972
• 3570
• 7567
• 5184

1890 is divisible by 2.

• True
• False

The price of gasoline decline Php 140 over a one week period. If the rate decrease was spread equally over the week, how much did the price of gasoline decrease in one day?

• Php 1600
• Php 2000
• pHP 2300
• Php 2800

1890 is divisible by 5.

• True
• False

The solution to 96 modulo 32 is _________.

37 mod 4 = ?

• 1
• 0
• 3
• 4

Using the Fermat number 2s + 1, find the value using s = 2.

• 3
• 7
• 9
• 5

____ mod 9 = 5

• 23
• 74
• -12
• 13

Which of the following numbers below is divisible by 2, 3, 5, and 7?

• 5,989
• 12,358
• 24,350
• 10,500

If the values of k are odd integers, thus the function has a certain symmetry.

• True
• False

Which of the following are the prime factors of 360?

• 23 x 33 x 5
• 23 x 32 x 5
• 22 x 32 x 5
• 23 x 34 x 5

What are the primitive roots of mod 209 using coprimes 7, 11, and 13 and base 2?

• 41, 82 and 167
• 41, 81 and 167
• 67, 113 and 205
• 82, 178 and 327

129 mod 13 = ?

• 10
• 7
• 12
• 11

Based on the given factor tree, what is the unknown number?

• 315
• 135
• 351
• 153

A power function has a fixed __________.

• exponent
• base
• form
• None of the choices

The following are the other quadratic residues of modulo 28 , EXCEPT

• 21
• 25
• 27
• 20

From the given numbers below, _______ is the coprime of 286?

• 19
• 2
• 13
• 11

What is the value of f(x) = 2xk, if k = 2.

• 2x2
• 2xk
• 2(2)k
• 2x(k)(2)

If a number is divisible by 31, multiply the last number to 3 and subtract from the remaining number. Repeat the steps if necessary.

• True
• False

A number is divisible by 2 and 3. Thus it is also divisible by 6.

• True
• False

Which of the following pairs of numbers shows a fundamental theorem of arithmetic?

• 23 x 27
• 21 x 48
• 89 x 97
• 37 x 49

Find the Least Common Multiple: 4 and 15

• 70
• 30
• 45
• 60

Find the Greatest Common Divisor. Apply any method: 1800 and 2300

• 50
• 200
• 300
• 100

If a number is divisible by 43, multiply 13 to the last digit of the number and add to the remaining number. Repeat steps if necessary.

• True
• False

Which of the following numbers below is a factor that is common to 120 and 42?

• 20
• 6
• 7
• 14

42 mod 5 = ?

• 2
• 3
• 5
• 8

-119 mod 16 = ?

• 9
• 11
• 8
• 7

35 modulo 7 = ?

The least common multiple of 9 and 12 is __________.

• 12
• 27
• 36
• 18

Which of the following numbers below is the GCD of 48 and 60?

• 6
• 12
• 16
• 4

The following expressions are correct, EXCEPT:

Which list below are the numbers arranged in order from greatest to smallest?

• 5, 4, 0, -3
• -5, -4, -3, -2, -1,
• 1, 3, 5, 7, 10,
• 2, 4, 6, 8, 10,

_________ is defined as the remainder of the bn less the modulo.

• Power Function
• Congruence Modulo
• Power Modulo
• Primitive Roots

Complete the statement: 152 = 225 = ___ (mod 27).

• 4
• 9
• 10
• 7

-60 mod ___ = 0

• 7
• 12
• 9
• 16

Using the Mersenne Primes, if you apply 23, the value is ______.

• 8,388,607
• 16,777,215
• 7, 787, 300
• 4,194,303

Power function is presented in the form f(x) = abc.

• True
• False

All numbers below are divisible by 3 except

• 5783
• 9102
• 7562
• 4704

Which solution is correct from the given factor tree below?

• None of the choices
• i only
• ii only
• i and ii

Which of the following prime numbers below is a Mersenne Prime?

• 89
• 127
• 23
• 13

1890 is divisible by 7.

• True
• False

Describe the value k of the function f(x) = 5xk, so that the answer is a fraction?

• Fraction
• Zero
• Positive
• Negative

Write all the multiples of 6 between 4 and 40.

• 6, 12, 18, 24, 30, 36
• 6, 12, 17, 24, 30, 38
• 6, 12, 18, 24, 32, 39
• 6, 10, 14, 18, 26, 37

The Greek letter t is used in finding the divisor function.

• True
• False

What is the GCD of 108 and 81?

• 27
• 12
• 29
• 9

If one of the factor of 420 is 14, the other one is____.

• 30
• 28
• 20
• 23

The following are the quadratic non residue of modulo 27, EXCEPT

• 16
• 14
• 15
• 17

Which of the following pair of numbers has a greatest common divisor of 159?

• 13, 685 and 490
• 5 120 and 1 510
• 14 628 and 5 565
• 9 325 and 7 608

Given: 162 = 256 = ___ (mod 27), what must be the value of the unknown?

• 13
• 14
• 12
• 15

Find the Greatest Common Divisor. Apply any method: 3425 and 4520

• 5
• 15
• 25
• 10

Find the Greatest Common Divisor: 36 and 99

• 9
• 12
• 18
• 3

The following are sets of integers, EXCEPT

• { 05, 1/3,}
• {-2, -5, -7,=E2=80=A6}
• {1, 2, 3,=E2=80=A6}
• {-3, -5, -7,=E2=80=A6}

Find the Greatest Common Divisor. Apply any method: 178 and 150

• 6
• 8
• 4
• 2

Which expression has a value different from the others?

• -3 + 2 + (-4)
• (4 - 3) - 4
• -11 - 4 + 12
• 3- 2 - 4

Which of the following pairs of numbers has a remainder of 12?

• 532 and 440
• 564 and 488
• 9 324 and 7 608
• 13 685 and 495

Which of the following is the way to find the prime factorization of 24?

• both i and ii

What must be the value of the last digit of 23, 31__ to make it divisible by 5?

If you substitute 5 to the Fermat form, the answer is ________?

• 32
• 31
• 11
• 33

Find TWO common multiples of the given numbers: 5 and 11

• 5 and 55
• 5 and 33
• 55 and 110
• 55 and 125

Find TWO common multiples of the given numbers: 8 and 9

• 32 and 72
• 72 and 144
• 56 and 64
• 54 and 144

Using the formula of Mersenne prime 2d =E2=80=93 1, if d = 17, the value is

• 131 075
• 131 071
• 131 072
• 131 073

The following expressions are , EXCEPT:

• None of the choices

If we substitute 7 for s, from the formula 2s + 1, then the answer is ____.

• 128
• 135
• 129
• 50

What is the value of the expression -5 + 5 + (-12)?

• -22
• 22
• -2
• -12

The following pairs below shows an example of fundamental theorem of arithmetic, EXCEPT:

• 17 x 19
• 7 x 41
• 9 x 11
• 11 x 3

If a number is divisible by 11, the last 3 digits must be divisible by 11.

• True
• False

Which of the following pairs of numbers has a remainder of 8?

• 536 and 488
• 5 126 and 1 512
• 650 and 273
• 3,541 and 897

=E2=80=9CIf a number is divisible by _________, multiply 3 to the last digit then add the remaining number. Repeat the steps if necessary.=E2=80=9D This rule applies in

• Divisibility of 29
• Divisibility of 17
• Divisibility of 19
• Divisibility of 23

The following are the multiples of 3 and 5, EXCEPT:

• {30, 60, 90,=E2=80=A6}
• {3, 6, 9,=E2=80=A6 5, 10,=E2=80=A6}
• {15, 30, 45,=E2=80=A6}
• {3, 7, 9,=E2=80=A6 5, 10,=E2=80=A6}

-46 mod 5 = ?

• 1
• -1
• 0
• 4

Find TWO common multiples of the given numbers: 2 and 5

• 15 and 30
• 5 and 15
• 10 and 20
• 20 and 25

Complete the expression =E2=80=9927 = 128 = ___ (mod 63)=E2=80=99

• 4
• 3
• 2
• 5

The number of multiples of 6 from 20 to 50 is ________.

• 5
• 7
• 8
• 4

What must be the value of the unknown if, ___ = 36 = 8 (mod 28)?

• 361
• 62
• 9 x 4
• 3 x 12

Given: 202 = 400 = 22 (mod ___), what must be the value of the unknown?

• 17
• 23
• 15
• 27

Which of the following number below is a Mersenne Prime?

• 31
• 13
• 7
• 23

1890 is divisible by 9.

• True
• False

The expressions below are all correct, EXCEPT:

• 53 = 125 = 10 (mod 15)
• 39 = 19 683 = 48 (mod 55)
• 24 = 16 = 7(mod 9)
• 25 = 32 = 4 (mod 7)

Which of the following expressions below is INCORRECT?

• 21 mod 6 = 3
• 82 mod 7 = 5
• 42 mod 2 = 2
• 100 mod 8 = 4

If a number is divisible by 47, multiply 14 to the last digit of the number and add from the remaining number. Repeat the steps if necessary.

• True
• False

Which of the following pairs of numbers below shows the properties of relatively prime?

• 99 and 100
• 63 and 21
• 2 and 36
• 15 and 90

Find the Least Common Multiple: 4, 6 and 8

• 28
• 32
• 16
• 24

The number of divisor of a certain integer is being added.

• True
• False

The Fermat form is in the form __________.

• 2s - 1
• 2s + 1

The numbers below are the common factors of 30 and 45, EXCEPT:

• 15
• 5
• 3
• 10

Simplify the expression 32 x 52 x 7 = ?

• 1575
• 1225
• 1455
• 1305

-87 mod 6 = ?

• 4
• 3
• 1
• 2

Find the Greatest Common Divisor: 976 and 696

• 4
• 8
• 2
• 3

What must be the value k to make the function f(x) = -3xk equal to -3?

4199 is divisible by 17.

• True
• False

Which of the following is the next step to find the remainder of 10,465 and 3,553?10 465 = 3 553(2) + 3 359 3 553 = 3 359(1) + 194 3 359 = 194(17) + 61

• 3 359 = 17(197) + 10
• 194 = 17(11) + 7
• 194 = 61(3) + 11
• 3 359 = 61(55) + 4

What are the unknown numbers in the factor tree?

• 2 and 18
• 3 and 12
• 1 and 36
• 4 and 9

Using Euclidean Algorithm, determine the remainder of 1 515 and 705

• 37
• 20
• 15
• 23

Find the Greatest Common Divisor. Apply any method: 366 and 420

• 4
• 6
• 2
• 3

Find the Greatest Common Divisor. Apply any method: 244 and 260

• 6
• 2
• 4
• 8

What is the greatest common factor of 36 848 and 77 080?

• 94
• 188
• 376
• 88

An exponential function has a fixed base that is raised to a variable.

• True
• False

The following numbers are coprime of 34, EXCEPT:

• Non of the choices
• 13
• 2
• 7

Write all the multiples of 12 between 20 and 150

• 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144
• 12, 36, 46, 60, 72, 83, 96, 108, 120, 132, 144
• 12, 24, 48, 60, 72, 84, 96, 108, 120, 132, 144
• 24, 36, 48, 60, 72, 83, 96, 108, 120, 132, 144

In a power function the base is a variable and raised to a fixed exponent.

• True
• False

How many primitive roots below 100 does 421 have if the coprimes are between 5 and 11, using 3 as base?

• 3
• 0
• 2
• 1

Which of the following is the quadratic non residue of modulo 27?

• 13
• 11
• 9
• 10

The expressions below are all , EXCEPT:

• 53 = 125 = 10 (mod 15)

88 mod 9 = ?

• 6
• 7
• 9
• 8

Using the function f(x) = -xk, if x = 0 and k is a negative integer then it is an example of singularity.

• True
• False

Which of the following is the prime factor of 81, 141?

• 31
• 43
• 21
• 19

-78 mod 8 = ?

• 2
• 4
• 1
• 0

Find the Least Common Multiple: 5 and 7

• 25
• 70
• 45
• 35

4199 is divisible by 11.

• True
• False

The following numbers are all Fermat numbers, EXCEPT:

• 2
• 5
• 3
• None of the choices