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Because 3 is greater than 1. I suppose it's possible to do it in your head, if you remember that in the world of fourths, 1 - 3 equals 2 but it's easier to subtract 3/4 from 17/4 or 3 and 5/4. As long as you can get to 3 and 1/2, it doesn't really matter, but don't tell your teacher I said that.

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โˆ™ 2013-03-20 17:49:27
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Q: Why is it necessary to rename 4 and 1 over 4 if you subtract 3 over 4 from it?
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