Arithmetic Grade Three

Lesson Twenty-five: Adding To Check Answer

You can add to check your answer to a subtraction problem:
You subtract 29 from 65 and you get 36. To double check and make sure your answer is right you add 36 and 29 together to get 65.
You subtract 13 from 41 and get 28. When you add 28 and 13 you get 41 and so you know you got the right answer!

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