Add 54/60 and 80/21
1st number: 54/60, 2nd number: 3 17/21
54/60 + 80/21 is 989/210.
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,
54/60 = 54 × 7/60 × 7 = 378/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
80/21 = 80 × 20/21 × 20 = 1600/420 - Add the two like fractions:
378/420 + 1600/420 = 378 + 1600/420 = 1978/420 - 1978/420 simplified gives 989/210
- So, 54/60 + 80/21 = 989/210
In mixed form: 4149/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/60+80/42 54/60+80/63