Add 20/15 and 90/28
1st number: 1 5/15, 2nd number: 3 6/28
20/15 + 90/28 is 191/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
20/15 = 20 × 28/15 × 28 = 560/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
90/28 = 90 × 15/28 × 15 = 1350/420 - Add the two like fractions:
560/420 + 1350/420 = 560 + 1350/420 = 1910/420 - 1910/420 simplified gives 191/42
- So, 20/15 + 90/28 = 191/42
In mixed form: 423/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+90/28 20/30+90/28 20/15+90/56 60/15+90/28 20/45+90/28 20/15+90/84 20/75+90/28