An easy way to explain...

asked Aug 13, 2017 67.3k views

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so first u subtracted 72 and 694 and got 622. then to check ur work, u added ur sum to 72 and got 694

JMichaelTX answered Aug 15, 2017

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it's very simple, 694-72= 622
so in order for you to check you answer you do the opposite
694-72 would equal 622
622+72 would equal 694

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