Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 7/21 from 42/18

1st number: 2 6/18, 2nd number: 7/21

42/18 - 7/21 is 2/1.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    42/18 = 42 × 7/18 × 7 = 294/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    7/21 = 7 × 6/21 × 6 = 42/126
  4. Subtract the two like fractions:
    294/126 - 42/126 = 294 - 42/126 = 252/126
  5. After reducing the fraction, the answer is 2/1

MathStep (Works offline)

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

Related:

© everydaycalculation.com