Add 21/14 and 81/20
1st number: 1 7/14, 2nd number: 4 1/20
21/14 + 81/20 is 111/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 14 × 10 = 140,
21/14 = 21 × 10/14 × 10 = 210/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
81/20 = 81 × 7/20 × 7 = 567/140 - Add the two like fractions:
210/140 + 567/140 = 210 + 567/140 = 777/140 - 777/140 simplified gives 111/20
- So, 21/14 + 81/20 = 111/20
In mixed form: 511/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14+81/20 21/28+81/20 21/14+81/40 63/14+81/20 21/42+81/20 21/14+81/60 21/70+81/20 21/98+81/20