Add 21/20 and 21/24
1st number: 1 1/20, 2nd number: 21/24
21/20 + 21/24 is 77/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 20 × 6 = 120,
21/20 = 21 × 6/20 × 6 = 126/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Add the two like fractions:
126/120 + 105/120 = 126 + 105/120 = 231/120 - 231/120 simplified gives 77/40
- So, 21/20 + 21/24 = 77/40
In mixed form: 137/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+21/24 21/20+42/24 21/40+21/24 21/20+21/48 63/20+21/24 21/20+63/24 21/60+21/24 21/20+21/72