To find out the blank under 120 you need to do,
120 ÷ 10
which it is 12.
To find out the blank under 12 you need to do,
12 ÷ 6
which is 2.
To find out the blank under 10 you need to do,
10 ÷ 2
which it is 5.
To find out the blank under 6 you need to do,
6 ÷ 3
which is 2.
To find out the blank under 150 you need to do,
150 ÷ 10
which is 15.
To find out the blank under 15 you need to do,
15 ÷ 3
which it is 5.
To find out the blank under 10 you need to do,
10 ÷ 2
which is 5.
Highest common factor for 120 and 150
30
