Add 4/21 and 21/20
1st number: 4/21, 2nd number: 1 1/20
4/21 + 21/20 is 521/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
4/21 = 4 × 20/21 × 20 = 80/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
21/20 = 21 × 21/20 × 21 = 441/420 - Add the two like fractions:
80/420 + 441/420 = 80 + 441/420 = 521/420 - So, 4/21 + 21/20 = 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: 8/21+21/20 4/21+42/20 4/42+21/20 4/21+21/40 12/21+21/20 4/21+63/20 4/63+21/20 4/21+21/60 20/21+21/20 28/21+21/20