Add 90/20 and 3/28
1st number: 4 10/20, 2nd number: 3/28
90/20 + 3/28 is 129/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
90/20 = 90 × 7/20 × 7 = 630/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
3/28 = 3 × 5/28 × 5 = 15/140 - Add the two like fractions:
630/140 + 15/140 = 630 + 15/140 = 645/140 - 645/140 simplified gives 129/28
- So, 90/20 + 3/28 = 129/28
In mixed form: 417/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+6/28 90/40+3/28 90/20+3/56 90/20+9/28 90/60+3/28 90/20+3/84 90/20+15/28 90/20+21/28