Add 21/20 and 12/63
1st number: 1 1/20, 2nd number: 12/63
21/20 + 12/63 is 521/420.
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,
12/63 = 12 × 20/63 × 20 = 240/1260 - Add the two like fractions:
1323/1260 + 240/1260 = 1323 + 240/1260 = 1563/1260 - 1563/1260 simplified gives 521/420
- So, 21/20 + 12/63 = 521/420
In mixed form: 1101/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+12/63 21/20+24/63 21/40+12/63 63/20+12/63 21/20+36/63 21/60+12/63 21/20+60/63 21/20+84/63