Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Add fractions

Add 21/80 and 70/63

1st number: 21/80, 2nd number: 1 7/63

21/80 + 70/63 is 989/720.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 63 is 5040

    Next, find the equivalent fraction of both fractional numbers with denominator 5040
  2. For the 1st fraction, since 80 × 63 = 5040,
    21/80 = 21 × 63/80 × 63 = 1323/5040
  3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
    70/63 = 70 × 80/63 × 80 = 5600/5040
  4. Add the two like fractions:
    1323/5040 + 5600/5040 = 1323 + 5600/5040 = 6923/5040
  5. 6923/5040 simplified gives 989/720
  6. So, 21/80 + 70/63 = 989/720
    In mixed form: 1269/720

MathStep (Works offline)

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

Related:

© everydaycalculation.com