Q&A for How to Find a Fraction of a Number

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Jack has $48, he spends $18. What fraction of his money is left?

Donagan

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There is 30 left. 30 is 30/48 of 48. 30/48 = 5/8.

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Question

If Susan works 10 hours a day, and her boss allows her to use (1/8) of the 10 hours for lunch. How long is her lunch break?

Donagan

Top Answerer

Find the answer with this equation: 10 x 1/8 = 10/8 = 1¼ = 1 hour and 15 minutes.

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Question

What fraction represents 3 x 3/2?

Donagan

Top Answerer

Multiply the whole number by the numerator, and keep the denominator.

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Question

3/5 of a number is 21. What is the number?

Orangejews

Community Answer

Translate to an equation with n = number, (3/5)*n = 21. Then multiply both sides by (5/3) to isolate n. (5/3)*(3/5)*n = (5/3)*21. Since (5/3)*(3/5)=1, that leaves n=(5/3)*21 which is technically an answer, but for full credit you should simplify it further: n = (5/3)*3*7 = 5*7 = 35.

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Question

Insurance used to be $223.00 per month and now is $553.00 How do I calculate the % of the increase?

Donagan

Top Answerer

Subtract the lower number from the higher number, divide by the lower number, multiply by 100, and include the % sign.

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Question

What is 18 out of 45 in fraction form?

Community Answer

Start by writing 18/45. Simplify by dividing by the highest common factor. In this case, 9 is the common factor. Divide both 18 and 45 by nine. The final answer is 2/5.

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What fraction of 435 is 221?

Donagan

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It is 221 / 435. That reduces to roughly 44 / 87 or slightly more than 1/2.

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In a class of 40 students, 16 of them wear glasses. What fraction of the total number of students wears glasses?

Donagan

Top Answerer

16/40 = 2/5.

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Question

How do I take 4/5 off 20?

Donagan

Top Answerer

4/5 is 80%. 20 multiplied by 80% (or .8) is 16. So subtract 16 from 20. Another way to think of it is that taking 4/5 off is the same as leaving 1/5. 1/5 of 20 is (.2)(20) = 4.

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How do I convert a fraction like 3/7 to hundredths?

Community Answer

Divide 3 by 7. That's 0.42857, or roughly 43/100.

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Gerry spends $100 of $600. What fraction of his money did he spend?

Community Answer

Gerry spent 1/6 of his money.

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How do I find the complement of a fraction?

Donagan

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The complement of a proper fraction is the difference between it and the number 1. So subtract the fraction from 1 to find its complement. For example, the complement of ¾ is ¼, because 1 - ¾ = ¼.

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Question

Mary read 1/3 of her book on Monday, 1/4 on Tuesday and the remaining 60 pages on Wednesday. What fraction did she read on Wednesday?

Donagan

Top Answerer

The fact that she read 60 pages on Wednesday is irrelevant here. Add the Monday and Tuesday fractions, then subtract the sum from 1. 1/3 + 1/4 = 4/12 + 3/12 = 7/12. 1 - 7/12 = 12/12 - 7/12 = 5/12. She read 5/12 of the book on Wednesday.

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Question

If 1,250 people like one drink and 750 like another, how can I find what percentage of people likes the first drink?

Community Answer

First we will find the total number of people in the group. Here total number of people is 1250+750 = 2000. Now, the fraction of the group that likes the first drink is 1250/2000. And the percentage will be 1250/2000 x 100 = 62.5%.

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One third of the pencils in a jar are red and the remaining 10 are green. How many are red?

Community Answer

5. There are 15 in total. 15 divided by three is 5. Just keep trying each multiple of three until you get the right one.

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