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You can do the fact backwards. ex. 3+4=7 turn it around 7-4=3

I believe it is called doing the inverse operation.

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Q: How does knowing an addition fact help with a subtraction fact?
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How do you think knowing that 125 plus 150 equals 275 can help you solve 275-150 equals?

By utilising the fact that subtraction is the reverse operation to addition. Thus, if A + B = C then C - B = A In this particular case, since 125 + 150 = 275 then 275 - 150 = 125

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