Add 8/15 and 90/21
1st number: 8/15, 2nd number: 4 6/21
8/15 + 90/21 is 506/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
8/15 = 8 × 7/15 × 7 = 56/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Add the two like fractions:
56/105 + 450/105 = 56 + 450/105 = 506/105 - So, 8/15 + 90/21 = 506/105
In mixed form: 486/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15+90/21 8/30+90/21 8/15+90/42 24/15+90/21 8/45+90/21 8/15+90/63 40/15+90/21 8/75+90/21 56/15+90/21