Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 9/10 from 21/8

1st number: 2 5/8, 2nd number: 9/10

21/8 - 9/10 is 69/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 10 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 8 × 5 = 40,
    21/8 = 21 × 5/8 × 5 = 105/40
  3. Likewise, for the 2nd fraction, since 10 × 4 = 40,
    9/10 = 9 × 4/10 × 4 = 36/40
  4. Subtract the two like fractions:
    105/40 - 36/40 = 105 - 36/40 = 69/40
  5. In mixed form: 129/40

MathStep (Works offline)

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

Related:

© everydaycalculation.com