Add 21/28 and 25/90
21/28 + 25/90 is 37/36.
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,
21/28 = 21 × 45/28 × 45 = 945/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
25/90 = 25 × 14/90 × 14 = 350/1260 - Add the two like fractions:
945/1260 + 350/1260 = 945 + 350/1260 = 1295/1260 - 1295/1260 simplified gives 37/36
- So, 21/28 + 25/90 = 37/36
In mixed form: 11/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+25/90 21/28+50/90 21/56+25/90 63/28+25/90 21/28+75/90 21/84+25/90