Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 12/21 and 21/40

12/21 + 21/40 is 307/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    12/21 = 12 × 40/21 × 40 = 480/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    21/40 = 21 × 21/40 × 21 = 441/840
  4. Add the two like fractions:
    480/840 + 441/840 = 480 + 441/840 = 921/840
  5. 921/840 simplified gives 307/280
  6. So, 12/21 + 21/40 = 307/280
    In mixed form: 127/280

MathStep (Works offline)

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

Related:

© everydaycalculation.com