Adding and Subtracting Fractions With Different Denominators

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Let's do another one:

3/5 + 2/9

The LCM of 5 and 9 is 45... So our LCD is 45.

Subtraction works the same way.

6/11 - 3/22

The LCM of 11 and 22 is 22... So the LCD is 22.

We just need to change the 6/11.

Done!

Head on over to the next page to try some fraction practice problems...