Add 90/28 and 70/15
1st number: 3 6/28, 2nd number: 4 10/15
90/28 + 70/15 is 331/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
90/28 = 90 × 15/28 × 15 = 1350/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
70/15 = 70 × 28/15 × 28 = 1960/420 - Add the two like fractions:
1350/420 + 1960/420 = 1350 + 1960/420 = 3310/420 - 3310/420 simplified gives 331/42
- So, 90/28 + 70/15 = 331/42
In mixed form: 737/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/56+70/15 90/28+70/30 90/84+70/15 90/28+70/45 90/28+70/75