Adding and Subtracting Fractions

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Adding and Subtracting Fractions

REMEMBER!

Only fractions with the same denominator can be added or subtracted.

Example:

1) Work out 3/5 + 2/3

Find the lowest common denominator of 5 and 3. In this case it's 15.

Change the fractions into their equivalent with a denominator of 15.

3 x3 9

_ = _

5 x3 15

2 x5 10

_ = _

3 x5 15

Now re-write the sum:

9/15 + 10/15 = 19/15 = 1 4/15

http://www.youtube.com/watch?v=t6Gz2zwmeD0 (Einbetten)

Fractions