Question

Describe how to use a tens fact to find the difference for 15-8

Answer 1

Because you need to subtract from 10, you need to do 10-8. Then you will add 5 since you took away 5 to subtract from 10.

Answer 2

Fiest do 15  with 5 is 20 so 8 - 5 = 3 so 20 and 3 is 23