Add 72/63 and 21/84
1st number: 1 9/63, 2nd number: 21/84
72/63 + 21/84 is 39/28.
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,
72/63 = 72 × 4/63 × 4 = 288/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Add the two like fractions:
288/252 + 63/252 = 288 + 63/252 = 351/252 - 351/252 simplified gives 39/28
- So, 72/63 + 21/84 = 39/28
In mixed form: 111/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/63+42/84 72/63+63/84