Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Subtract fractions

Subtract 25/8 from 21/90

1st number: 21/90, 2nd number: 3 1/8

21/90 - 25/8 is -347/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 8 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 90 × 4 = 360,
    21/90 = 21 × 4/90 × 4 = 84/360
  3. Likewise, for the 2nd fraction, since 8 × 45 = 360,
    25/8 = 25 × 45/8 × 45 = 1125/360
  4. Subtract the two like fractions:
    84/360 - 1125/360 = 84 - 1125/360 = -1041/360
  5. After reducing the fraction, the answer is -347/120

MathStep (Works offline)

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

Related:

© everydaycalculation.com