Add 25/21 and 90/28
1st number: 1 4/21, 2nd number: 3 6/28
25/21 + 90/28 is 185/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
25/21 = 25 × 4/21 × 4 = 100/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
90/28 = 90 × 3/28 × 3 = 270/84 - Add the two like fractions:
100/84 + 270/84 = 100 + 270/84 = 370/84 - 370/84 simplified gives 185/42
- So, 25/21 + 90/28 = 185/42
In mixed form: 417/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21+90/28 25/42+90/28 25/21+90/56 75/21+90/28 25/63+90/28 25/21+90/84