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

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  • Question
    Jack has $48, he spends $18. What fraction of his money is left?
    Donagan
    Top Answerer
    There is 30 left. 30 is 30/48 of 48. 30/48 = 5/8.
  • 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.
  • Question
    What fraction represents 3 x 3/2?
    Donagan
    Top Answerer
    Multiply the whole number by the numerator, and keep the denominator.
  • 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.
  • 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.
  • 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.
  • Question
    What fraction of 435 is 221?
    Donagan
    Top Answerer
    It is 221 / 435. That reduces to roughly 44 / 87 or slightly more than 1/2.
  • Question
    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.
  • 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.
  • Question
    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.
  • Question
    Gerry spends $100 of $600. What fraction of his money did he spend?
    Community Answer
    Gerry spent 1/6 of his money.
  • Question
    How do I find the complement of a fraction?
    Donagan
    Top Answerer
    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.
  • 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.
  • 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%.
  • Question
    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.
  • Question
    A fraction of 64 is equal to 8. How do you work out the fraction?
    Community Answer
    Divide 8 by 64. 8/64 = 1/8. 8 is one-eighth of 64.
  • Question
    Subtract 2 1/2 from 17 1/3?
    I_l1ke_gam3s
    Community Answer
    17 1/3 - 2 1/2 = 17 2/6 - 2 3/6 = 16 8/6 - 2 3/6 = 14 5/6. Your answer is 14 5/6.
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