you basically just add the 2 additional problems and to check your answer take your answer that you get and subtract one of your additional numbers and see if your answer is the other additional number.
example: (2+5=7) now, your checking it. example: (7-5=2 or 7-2=5)
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Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.
Subtraction can be seen as the inverse operation to addition.
Subtraction is the addition of a negative number.
You don't. You can check addition with subtraction or subtraction with addition, since subtraction is the opposite of addition. Similary, you can check division with multiplication, or vice versa.