The greatest common factor and the least common factor

Which includes prime numbers are . . .

• {1, 2, 5, 7, 9}

• {2, 3, 7, 11, 15}

• {2, 5, 7, 11, 19}

• {2, 3, 11, 17, 21}

The prime factors of 364 are . . .

• 4 and 91

• 2 and 91

• 4, 7 and 13

• 2, 7 and 13

• 3

• 6

• 8

• 12

The greatest common factor of 26 and 64 is . . .

• 4

• 8

• 6

• 12

The greatest common factor of 15, 25 and 45 is . . .

• 45

• 15

• 5

• 3

The prime factorization of 90 is . . .

The least common factor of 90 and 135 is . . .

• 90

• 135

• 270

• 180

The least common factor of 14, 28 and 42 is . . .

• 84

• 42

• 48

• 28

The greatest common factor of 24, 42 and 70 is . . .

• 2

• 7

• 14

• 28

The greatest common factor and least common factor of 6, 12 and 15 is . . .

• 3 and 60

• 6 and 90

• 3 and 120

• 6 and 60