Add 18/28 and 72/90
18/28 + 72/90 is 101/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
18/28 = 18 × 45/28 × 45 = 810/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
72/90 = 72 × 14/90 × 14 = 1008/1260 - Add the two like fractions:
810/1260 + 1008/1260 = 810 + 1008/1260 = 1818/1260 - 1818/1260 simplified gives 101/70
- So, 18/28 + 72/90 = 101/70
In mixed form: 131/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+72/90 18/56+72/90 54/28+72/90 18/84+72/90 90/28+72/90