Factors, Multiples, Prime Numbers

Factors of 15.

• 1,3,5,15

• 1,3,5,10,15

First three multiples of 16.

• 16,26,48

• 16,32,48

Common multiple of 12 and 30.

• 6

• 60

4 is a common factor of 26 and 32.

• True

• False

42 is a common multiple of 7 and 21.

• True

• False

Factors of 63.

• 1, 3, 7, 9, 21, 63

• 1, 3, 7, 9, 31, 63

The sixth multiple of 30.

• 120

• 150

• 180

• 210

Prime numbers between 20 and 30.

• 23, 29

• 21, 23, 29

• 21, 23, 27, 29

• 21, 23, 25, 29

97 is a prime number.

• True

• False

Prime factors of 42.

• 2, 3

• 2, 7

• 2, 3, 5

• 2, 3, 7