Multiplying and Dividing Fractions

How do we write the number 3 as a fraction?

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Answer explanation

 $\frac{3}{1}\ is\ the\ answer$  

 $\frac{1}{2}\ x\ 2$  

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 $3\ x\ \frac{1}{2}$  

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 $\frac{1}{2}\ x\ \frac{1}{2}$  

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 $\frac{3}{4}\ x\ \frac{1}{4}$  

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Do we need to find a common denominator when multiplying or dividing fractions?

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 $\frac{2}{5}\ x\ \frac{1}{4}$  

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 $\frac{3}{4}\ x\ \frac{3}{5}$  

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 $1\frac{2}{3}\ x\ \frac{2}{7}$  

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 $3\frac{1}{4}\ x\ \ 2\frac{1}{3}$  

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