Question

the answer for 6 X 15 can be found by adding 2 x 15 and 4 x 15. What need to be added to 2 x 15 to get 12 x15?

Answer 1

150

Explanation:

15 x 6=90 and 15 x 2=30+15 x 4=60+30=90

15 x 2=30 so to get to 15 x 12(180) you would have to add 150