Add 25/28 and 15/90
25/28 + 15/90 is 89/84.
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,
25/28 = 25 × 45/28 × 45 = 1125/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
15/90 = 15 × 14/90 × 14 = 210/1260 - Add the two like fractions:
1125/1260 + 210/1260 = 1125 + 210/1260 = 1335/1260 - 1335/1260 simplified gives 89/84
- So, 25/28 + 15/90 = 89/84
In mixed form: 15/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/28+15/90 25/28+30/90 25/56+15/90 75/28+15/90 25/28+45/90 25/84+15/90 25/28+75/90