Tuesday, February 13, 2007

Notes on Multiplying & Dividing Fractions

To the left you will find the basics for multiplying and dividing fractions.

All mixed or whole numbers must be turned into improper fractions before you can start.

Since it's multiplication, you can simplify either simplify before or after working the problem. This is possible because of the Commutative Property of Multiplication, which allows you to multiply numbers in any order and still get the same answer (i.e. 2 x 3 = 3 x 2).

The easiest way to divide fractions is to remember the phrase Keep--Change--Flip: Keep the 1st fraction, Change the divide to multiple, Flip the 2nd fraction.

Another way to look at division of fractions is to multiply by the reciprocal, the inverse of the 2nd fraction.

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