Add 81/28 and 30/90
1st number: 2 25/28, 2nd number: 30/90
81/28 + 30/90 is 271/84.
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,
81/28 = 81 × 45/28 × 45 = 3645/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
30/90 = 30 × 14/90 × 14 = 420/1260 - Add the two like fractions:
3645/1260 + 420/1260 = 3645 + 420/1260 = 4065/1260 - 4065/1260 simplified gives 271/84
- So, 81/28 + 30/90 = 271/84
In mixed form: 319/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/28+60/90 81/56+30/90 81/84+30/90