Add 84/15 and 90/7
1st number: 5 9/15, 2nd number: 12 6/7
84/15 + 90/7 is 646/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
84/15 = 84 × 7/15 × 7 = 588/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
90/7 = 90 × 15/7 × 15 = 1350/105 - Add the two like fractions:
588/105 + 1350/105 = 588 + 1350/105 = 1938/105 - 1938/105 simplified gives 646/35
- So, 84/15 + 90/7 = 646/35
In mixed form: 1816/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30+90/7 84/15+90/14 84/45+90/7 84/15+90/21 84/75+90/7 84/15+90/35 84/15+90/49