Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 9/21 and 12/40

9/21 + 12/40 is 51/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    9/21 = 9 × 40/21 × 40 = 360/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    12/40 = 12 × 21/40 × 21 = 252/840
  4. Add the two fractions:
    360/840 + 252/840 = 360 + 252/840 = 612/840
  5. After reducing the fraction, the answer is 51/70

MathStep (Works offline)

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

Related:

© everydaycalculation.com