100

***Div. the common factors of 2 and 5 out of both num. and den.**

***Write as prod. of num. over prod. of den.**

***Div. the common factor of 7 out of both num.
and den.**

The first fraction has a denominator of 1 and the second fraction has
a denominator of 4. What is the smallest number that is divisible
by both 1 and 4. If you said 4, you are correct?

**Therefore, the LCD is 4.**

***Multiply num. and den. by 4.**

The fraction 9/4 already has a denominator of 4, so we do not have
to rewrite it.

Note that this fraction is in simplest form. There are no common
factors that we can divide out of the numerator and denominator

The first fraction has a denominator of 4, the second has a denominator
of 5, and the third has a denominator of 10. What is the smallest
number that is divisible by 4, 5, and 10? If you said 20, you are
correct?

**Therefore, the LCD is 20.**

***Multiply num. and den. by 5.**

***Multiply num. and den. by 4.**

***Multiply num. and den. by 2.**

***Write the sum and difference over the common
den.**

Last revised on July 24, 2011 by Kim Seward.

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