Add 18/21 and 21/80
18/21 + 21/80 is 627/560.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
18/21 = 18 × 80/21 × 80 = 1440/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
21/80 = 21 × 21/80 × 21 = 441/1680 - Add the two like fractions:
1440/1680 + 441/1680 = 1440 + 441/1680 = 1881/1680 - 1881/1680 simplified gives 627/560
- So, 18/21 + 21/80 = 627/560
In mixed form: 167/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+21/80 18/21+42/80 18/42+21/80 54/21+21/80 18/21+63/80 18/63+21/80 90/21+21/80