Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 49/80 from 7/21

7/21 - 49/80 is -67/240.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    7/21 = 7 × 80/21 × 80 = 560/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    49/80 = 49 × 21/80 × 21 = 1029/1680
  4. Subtract the two fractions:
    560/1680 - 1029/1680 = 560 - 1029/1680 = -469/1680
  5. After reducing the fraction, the answer is -67/240

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

© everydaycalculation.com