Add Within 20 Using Make Ten - Arithmetic Step by Step

Add 8 + 7 using the make-ten strategy: split 7 into 2 + 5, make 8 + 2 = 10, then add 5 to get 15.

Example

add-8-7.math

    8 + 7

step: start with 8, need 2 more to reach 10
step: split 7 into 2 + 5
step: 8 + 2 = 10
step: 10 + 5 = 15
step: 8 + 7 = 15

make-ten Split one addend to bring the other up to 10, then add the leftover. For 8 + 7: 8 needs 2 more to reach 10, so split 7 into 2 + 5. Then 8 + 2 = 10 and 10 + 5 = 15.