Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 40/7 from 70/21

1st number: 3 7/21, 2nd number: 5 5/7

70/21 - 40/7 is -50/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21
  2. For the 1st fraction, since 21 × 1 = 21,
    70/21 = 70 × 1/21 × 1 = 70/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    40/7 = 40 × 3/7 × 3 = 120/21
  4. Subtract the two fractions:
    70/21 - 120/21 = 70 - 120/21 = -50/21

MathStep (Works offline)

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

Related:

© everydaycalculation.com