The Math Meridian
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Check subtraction with addition

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Learn it Subtraction and addition undo each other. Add your answer to the number you took away. You should get the starting number.

Example: Check $72 - 35 = 37$.

  1. Add the answer and the number taken away: $37 + 35$.
  2. $37 + 35 = 72$.
  3. That's the start number, so the answer is right.

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