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8 February, 17:19

Homework & practice 3-4 mental math

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  1. 8 February, 18:21
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    3-4=-1. To use mental math, imagine that there is a number line in your head. Start at three, and since we're subtracting, move to the left 4 units. This will land you at - 1. I hope this gets easier for you in the future!
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