Add 84/7 and 21/80
1st number: 12 0/7, 2nd number: 21/80
84/7 + 21/80 is 981/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 7 × 80 = 560,
84/7 = 84 × 80/7 × 80 = 6720/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Add the two like fractions:
6720/560 + 147/560 = 6720 + 147/560 = 6867/560 - 6867/560 simplified gives 981/80
- So, 84/7 + 21/80 = 981/80
In mixed form: 1221/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7+42/80 84/14+21/80 84/7+63/80 84/21+21/80 84/35+21/80 84/49+21/80