Add 30/63 and 21/84
30/63 + 21/84 is 61/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
30/63 = 30 × 4/63 × 4 = 120/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Add the two like fractions:
120/252 + 63/252 = 120 + 63/252 = 183/252 - 183/252 simplified gives 61/84
- So, 30/63 + 21/84 = 61/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/63+21/84 30/63+42/84 90/63+21/84 30/63+63/84