Question

How to check the addition by coresponding addition

Answer 1

Answer:

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Answer 2

Answer:

15 + 5 = 20

20 - 5 = 15

Step by Step Explaination:

1. Add the digits of each number in the problem until you get a single-digit just like you did for addition. 2. Then subtract the numbers you arrived at and compare this number to the single-digit representing the answer.