Add 72/90 and 45/28
1st number: 72/90, 2nd number: 1 17/28
72/90 + 45/28 is 337/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 28 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
72/90 = 72 × 14/90 × 14 = 1008/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
45/28 = 45 × 45/28 × 45 = 2025/1260 - Add the two like fractions:
1008/1260 + 2025/1260 = 1008 + 2025/1260 = 3033/1260 - 3033/1260 simplified gives 337/140
- So, 72/90 + 45/28 = 337/140
In mixed form: 257/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+90/28 72/90+45/56 72/90+45/84