Add 20/28 and 63/90
20/28 + 63/90 is 99/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
20/28 = 20 × 45/28 × 45 = 900/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
63/90 = 63 × 14/90 × 14 = 882/1260 - Add the two like fractions:
900/1260 + 882/1260 = 900 + 882/1260 = 1782/1260 - 1782/1260 simplified gives 99/70
- So, 20/28 + 63/90 = 99/70
In mixed form: 129/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+63/90 20/56+63/90 60/28+63/90 20/84+63/90