Answer:

A.write each number as a product of its pair of number. example:1.16=2x2x2x2

1.24= 4 × 3 × 2

2.30= 5 × 3 × 2

3.32= 4 × 2 × 2 × 2

4.48= 6 × 2 × 2 × 2

B.find the greatest common factor of each pair of numbers.

1.15&20 = 5

2.16&20 = 4

3.9&21 = 3

4.17&51 = 17

5.36&42 = 6

C.find the least common multiples of each set of numbers.

1.24&40 = 120

2.25&30 = 150

3.18&27 = 54

4.10&15 = 30

5.8&10 = 40

6.18&6 = 18