Add 72/63 and 21/20
1st number: 1 9/63, 2nd number: 1 1/20
72/63 + 21/20 is 307/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 63 × 20 = 1260,
72/63 = 72 × 20/63 × 20 = 1440/1260 - Likewise, for the 2nd fraction, since 20 × 63 = 1260,
21/20 = 21 × 63/20 × 63 = 1323/1260 - Add the two like fractions:
1440/1260 + 1323/1260 = 1440 + 1323/1260 = 2763/1260 - 2763/1260 simplified gives 307/140
- So, 72/63 + 21/20 = 307/140
In mixed form: 227/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/63+42/20 72/63+21/40 72/63+63/20 72/63+21/60