Add 21/60 and 81/28
1st number: 21/60, 2nd number: 2 25/28
21/60 + 81/28 is 227/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
81/28 = 81 × 15/28 × 15 = 1215/420 - Add the two like fractions:
147/420 + 1215/420 = 147 + 1215/420 = 1362/420 - 1362/420 simplified gives 227/70
- So, 21/60 + 81/28 = 227/70
In mixed form: 317/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+81/28 21/60+81/56 63/60+81/28 21/60+81/84