Add 81/84 and 21/60
81/84 + 21/60 is 46/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Add the two like fractions:
405/420 + 147/420 = 405 + 147/420 = 552/420 - 552/420 simplified gives 46/35
- So, 81/84 + 21/60 = 46/35
In mixed form: 111/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+42/60 81/84+63/60