What are the first 3 multiples of 8?
16, 24, 32
Is 18 a multiple of 2? Why?
Yes: 9 x 2 = 18
What number is always a factor of any other number? Why?
1: Whether a number is prime or composite, it can always be divided by itself.
Is 7 a factor of 28? Explain.
Yes: 7 x 4 = 28
Is 5 a factor of 32? Why?
No. There is no multiple of 5 that gives 32.
What are all the factors of 28?
1, 2, 4, 7, 14, 28
List all the factors of 15.
1, 3, 5, 15
Is 51 prime or composite? Why?
Composite: 17 x 3 = 51
Is 17 prime or composite? Why?
Prime: It only has factors of 1 and itself.
Is 91 prime or composite? Why?
Composite: 13 x 7 = 91
Is 3 a factor of 27? Why?
Yes. 3 x 9 = 27
Is 39 a multiple of 3? Why?
Yes: 13 x 3 = 39
Is 49 prime or composite? Why?
Composite: 7 x 7 = 49
List all the factors of 18.
1, 2, 3, 6, 9, 18
Sam says that 51 is a composite number. Is he correct? Why?
Yes: 17 x 3 = 51
What are the first 3 multiples of 20?
40, 60, 80
Is 3 a multiple of 9?
No: 3 is a factor of 9, not a multiple.
Is 12 a factor of 3?
No, 12 is a multiple of 3, not a factor.
Is 24 a factor of 6?
No: 24 is a multiple of 6, not a factor.
Is 57 prime or composite? Why?
Composite: 19 x 3 = 57
Is 91 prime or composite? Why?
Composite: 13 x 7 = 91
Is 31 prime or composite? Why?
Prime: It only has factors of 1 and itself
Is 11 a factor of 77?
Yes. 11 x 7 = 77
Is 15 prime or composite? Why?
Composite: 3 x 5 = 15