Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Subtract fractions

Subtract 18/7 from 21/3

1st number: 7 0/3, 2nd number: 2 4/7

21/3 - 18/7 is 31/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 3 and 7 is 21
  2. For the 1st fraction, since 3 × 7 = 21,
    21/3 = 21 × 7/3 × 7 = 147/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    18/7 = 18 × 3/7 × 3 = 54/21
  4. Subtract the two fractions:
    147/21 - 54/21 = 147 - 54/21 = 93/21
  5. After reducing the fraction, the answer is 31/7
  6. In mixed form: 43/7

MathStep (Works offline)

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

Related:

© everydaycalculation.com