Add 63/84 and 21/90
63/84 + 21/90 is 59/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
63/84 = 63 × 15/84 × 15 = 945/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
21/90 = 21 × 14/90 × 14 = 294/1260 - Add the two like fractions:
945/1260 + 294/1260 = 945 + 294/1260 = 1239/1260 - 1239/1260 simplified gives 59/60
- So, 63/84 + 21/90 = 59/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/84+42/90 63/84+63/90