Is 15 prime or composite? Why?
Composite: 3 x 5 = 15
Is 17 prime or composite? Why?
Prime: It only has factors of 1 and itself.
Is 31 prime or composite? Why?
Prime: It only has factors of 1 and itself
Is 49 prime or composite? Why?
Composite: 7 x 7 = 49
Is 51 prime or composite? Why?
Composite: 17 x 3 = 51
Is 91 prime or composite? Why?
Composite: 13 x 7 = 91
List all the factors of 15.
1, 3, 5, 15
List all the factors of 18.
1, 2, 3, 6, 9, 18
Is 3 a factor of 27? Why?
Yes. 3 x 9 = 27
Is 5 a factor of 32? Why?
No. There is no multiple of 5 that gives 32.
Is 11 a factor of 77?
Yes. 11 x 7 = 77
What are all the factors of 28?
1, 2, 4, 7, 14, 28
What are the first 3 multiples of 8?
16, 24, 32
What are the first 3 multiples of 20?
40, 60, 80
Is 18 a multiple of 2? Why?
Yes: 9 x 2 = 18
Is 39 a multiple of 3? Why?
Yes: 13 x 3 = 39
