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how can i find the volume of a rectangular prism when the sides are fractions?

rectangular prisms

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Kurt T. | Math Tutoring and Test PrepMath Tutoring and Test Prep
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Same way you do when the sides are integers.  For example, if the three sides are 3/4, 1 1/2. and 3 1/2, convert the mixed numbers to improper fractions, multiply all numerators, multiply all denominators, and convert your answer to a mixed number (if greater than 1) in lowest terms...

3/4 * 3/2 * 7/2 = (3*3*7) / (4*2*2) = 63/16 = 3 15/16