Show how to make a ten to solve 3 - 7

The 3 is a positive integer and the 7 is a negative integer so you would do "KFC" also known as (Keep, Flip, and Change)

3
("Keep" the 3 positive)
-
("Flip"the minus sign into a plus sign)

-7
("Change" the negative sign into a positive sign)

So therefore, you would have:

3 + 7, which equals 10