Add 84/15 and 90/28
1st number: 5 9/15, 2nd number: 3 6/28
84/15 + 90/28 is 617/70.
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,
84/15 = 84 × 28/15 × 28 = 2352/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
90/28 = 90 × 15/28 × 15 = 1350/420 - Add the two like fractions:
2352/420 + 1350/420 = 2352 + 1350/420 = 3702/420 - 3702/420 simplified gives 617/70
- So, 84/15 + 90/28 = 617/70
In mixed form: 857/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30+90/28 84/15+90/56 84/45+90/28 84/15+90/84 84/75+90/28