Add 21/28 and 80/18
1st number: 21/28, 2nd number: 4 8/18
21/28 + 80/18 is 187/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
80/18 = 80 × 14/18 × 14 = 1120/252 - Add the two like fractions:
189/252 + 1120/252 = 189 + 1120/252 = 1309/252 - 1309/252 simplified gives 187/36
- So, 21/28 + 80/18 = 187/36
In mixed form: 57/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+80/18 21/56+80/18 21/28+80/36 63/28+80/18 21/84+80/18 21/28+80/54 21/28+80/90