To add or subtract fractions, the denominators must be the same.
This lesson gives you practice renaming fractions with a desired denominator.
EXAMPLES:
Question:
Write
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$\,\displaystyle\frac{2}{7}\,$ with a denominator of $\,14\,$:
Solution:
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$\displaystyle\frac{2}{7} = \frac{4}{14}$
The key is to multiply by
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$\,1\,$ in the correct way!
The original denominator is $\,7\,$;
the desired denominator is $\,14\,$.
What must
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$\,7\,$ be multiplied by, to get $\,14\,$? Answer: $\,2\,$
Thus, you multiply by
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$\,1\,$ in the form of $\,\displaystyle\frac{2}{2}\,$, as shown below:
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$\displaystyle\frac{2}{7} = \frac{2}{7}\cdot\frac{2}{2} = \frac{4}{14}$
Master the ideas from this section
by practicing the exercise at the bottom of this page.
When you're done practicing, move on to:
Practice with Factors