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Factors, Multiples and Primes

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  • True or false: all odd numbers are prime
    false
  • Franz wants to list the first 4 multiples of 2. If he starts with 2, what are the next 3 multiples?
    4, 6, 8
  • is 45 prime or composite?
    composite
  • Which are prime and which are composite? 63, 22, 31
    composite: 63, 22     prime: 31
  • Which of the following numbers is NOT a multiple of 5? "15" , "35", "54", "90"
    54
  • Which are prime and which are composite? 17, 7, 24
    Composite: 24     prime: 7, 17
  • What are ALL the factors of 35?
    1, 5, 7, 35
  • What are the first 3 multiples of 11?
    11, 22, 33
  • Write 28 as the product of prime factors
    2 x 2 x 7
  • What are ALL the factors of 18?
    1, 2, 3, 6, 9, 18
  • Is 7 a factor of 56? Prove your answer
    Yes, 7x8 is 56
  • Write 72 as the product of prime factors
    2 x 2 x 2 x 3 x 3
  • 42 is a ( factor / multiple) of 6.
    Multiple
  • What are the first 3 multiples of 4?
    4, 8, 12
  • The least multiple of 20 is ________.
    20
  • Which number is the smallest multiple of 7?
    7
  • Is 19 prime or composite?
    prime
  • Find the first 3 multiples of 4.
    4, 8, 12
  • Besides 1 and 27, what are the other factors of 27
    3, 9
  • 16 has _________ factors.
    5
  • Is 6 a factor of 33? Prove your answer.
    No, because 6x5 is 30. If I add 6 more, it will be 36 which is more than 33.
  • 28 is a factor of ( 102 / 84 / 7 / 4 ).
    84
  • The 6th multiple of 7 is ______.
    42
  • How many factors does a prime number have?
    2
  • Find all the factors of 32.
    1, 2, 4, 8, 16, 32
  • Find all the factors of 50.
    1, 2, 5, 10, 25, 50
  • Is 4 a factor of 36? Prove your answer.
    Yes, because 4x9 is 36
  • True or false: All even numbers are composite
    false
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