Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 21/27 from 42/70

42/70 - 21/27 is -8/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 27 is 1890
  2. For the 1st fraction, since 70 × 27 = 1890,
    42/70 = 42 × 27/70 × 27 = 1134/1890
  3. Likewise, for the 2nd fraction, since 27 × 70 = 1890,
    21/27 = 21 × 70/27 × 70 = 1470/1890
  4. Subtract the two fractions:
    1134/1890 - 1470/1890 = 1134 - 1470/1890 = -336/1890
  5. After reducing the fraction, the answer is -8/45

MathStep (Works offline)

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

Related:

© everydaycalculation.com