Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 42/8 from 21/28

1st number: 21/28, 2nd number: 5 2/8

21/28 - 42/8 is -9/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 8 is 56

    Next, find the equivalent fraction of both fractional numbers with denominator 56
  2. For the 1st fraction, since 28 × 2 = 56,
    21/28 = 21 × 2/28 × 2 = 42/56
  3. Likewise, for the 2nd fraction, since 8 × 7 = 56,
    42/8 = 42 × 7/8 × 7 = 294/56
  4. Subtract the two like fractions:
    42/56 - 294/56 = 42 - 294/56 = -252/56
  5. After reducing the fraction, the answer is -9/2

MathStep (Works offline)

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

Related:

© everydaycalculation.com