Q&A for How to Calculate Fractions

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What is 5/8 times 16?

Donagan

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To multiply a fraction by a whole number, multiply the numerator by the whole number to get the new numerator. The denominator remains unchanged. (5/8)(16) = 80/8 = 10.

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Question

How do I calculate 2/3 × -5/6?

Donagan

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(2/3)(-5/6) = [(2)(-5)] / [(3)(6)] = -10/18 = -5/9.

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Question

How do I calculate this fraction: 8/5 * 8/5 - 9/5?

I_l1ke_gam3s

Community Answer

8/5 x 8/5 = 64/25. Convert 9/5 to 45/25. Then 64/25 - 45/25 = 19/25. Your answer is 19/25.

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Question

How do you convert a mixed number into an improper fraction?

Community Answer

Multiply the denominator by the whole number, then add that result to the numerator of the fraction to get the final numerator. The final denominator is the same as the denominator in the fraction of the mixed number.

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Question

How do I calculate 1/2 is equal to?/8

Community Answer

Let 1/2 = x/8. Solve for x by cross-multiplying: (1)(8) = (x)(2). Divide both sides of the equation by 2, and x = 4. So 1/2 = 4/8.

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How do I calculate 1/5 - 1/4 = 7/15?

Community Answer

You don't. 1/5 - 1/4 = 4/20 - 5/20 = -1/20.

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How do you add 2 1/2 + 7/10+ 1 1/4?

Community Answer

2 1/2 + 7/10 + 1 1/4 = 5/2 + 7/10 + 5/4 = 50/20 + 14/20 + 25/20 = 89/20 = 4 9/20.

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How do you calculate 14/13 - 13/15?

Community Answer

Find the common denominator. Then subtract the second numerator from the first, and keep the common denominator.

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Question

How do you rearrange these fractions from largest to smallest: 6/12, 3/4, 5/8, 1/16?

Community Answer

First find the lowest common denominator. Because 12 is a multiple of 4 and 16 is a multiple of 8, you can find the LCD by multiplying 12 by 16 (and then perhaps reducing). (12)(16) = 192. That is a common denominator but not the lowest common denominator. If you divide by 192 by 2, you get 96, which is the lowest common denominator. So the fractions convert to 48/96, 72/96, 60/96 and 6/96, respectively. Arranged from largest to smallest, they are 72/96, 60/96, 48/96 and 6/96. So the rearranged original fractions are 3/4, 5/8, 6/12 and 1/16.

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How do you know if a fraction is greater than or less than another fraction?

Community Answer

Convert one or both fractions so that they both have the same denominator. Then the fraction with the greater numerator is the greater fraction. For example, if you're comparing 2/3 and 3/4, convert them to 8/12 and 9/12, respectively. Because 9/12 is greater than 8/12, 3/4 is greater than 2/3.

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How do you calculate 2/7 ÷ 20\28?

Community Answer

Let's assume the problem is (2/7) ÷ (20/28). First reduce 20/28 to 5/7. You could then solve the problem by inspection if you recognize that 2/7 divided by 5/7 is simply 2/5. However, to solve by the regular method, (2/7) ÷ (5/7) = (2/7)(7/5) = 14/35 = 2/5.

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