The proper time to borrow is when... one of the mixed numbers is too big. We can subtract fractions to make them improper or if the mixed numbers in the mixed fractions are too big we can just borrow.

**100 2/4 - 6 3/4**

*PICTURE:*

The proper time to use the improper way is when... the numbers are small and when you can't take something larger from something smaller.

*PICTURE:*
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