Checking Subtraction

I know how to add and subtract, but sometimes I make careless mistakes. I need an easy way to check my answers.

We can use addition to check subtraction.

We can use addition tocheck subtraction.

Does it match? Yes No

Does it match?

Now that I know an easy way to check my subtraction, I bet I’ll make better grades on my math papers!

Checking answers makes subtraction easy!