Add 21/20 and 18/63
1st number: 1 1/20, 2nd number: 18/63
21/20 + 18/63 is 187/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 63 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 20 × 63 = 1260,
21/20 = 21 × 63/20 × 63 = 1323/1260 - Likewise, for the 2nd fraction, since 63 × 20 = 1260,
18/63 = 18 × 20/63 × 20 = 360/1260 - Add the two like fractions:
1323/1260 + 360/1260 = 1323 + 360/1260 = 1683/1260 - 1683/1260 simplified gives 187/140
- So, 21/20 + 18/63 = 187/140
In mixed form: 147/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+18/63 21/20+36/63 21/40+18/63 63/20+18/63 21/20+54/63 21/60+18/63 21/20+90/63