Add 81/60 and 8/21
1st number: 1 21/60, 2nd number: 8/21
81/60 + 8/21 is 727/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
81/60 = 81 × 7/60 × 7 = 567/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
8/21 = 8 × 20/21 × 20 = 160/420 - Add the two like fractions:
567/420 + 160/420 = 567 + 160/420 = 727/420 - So, 81/60 + 8/21 = 727/420
In mixed form: 1307/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/60+16/21 81/60+8/42 81/60+24/21 81/60+8/63 81/60+40/21 81/60+56/21