Add 18/21 and 28/80
18/21 + 28/80 is 169/140.
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,
28/80 = 28 × 21/80 × 21 = 588/1680 - Add the two like fractions:
1440/1680 + 588/1680 = 1440 + 588/1680 = 2028/1680 - 2028/1680 simplified gives 169/140
- So, 18/21 + 28/80 = 169/140
In mixed form: 129/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+28/80 18/21+56/80 18/42+28/80 54/21+28/80 18/21+84/80 18/63+28/80 90/21+28/80