Add 8/15 and 5/21
8/15 + 5/21 is 27/35.
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,
5/21 = 5 × 5/21 × 5 = 25/105 - Add the two like fractions:
56/105 + 25/105 = 56 + 25/105 = 81/105 - 81/105 simplified gives 27/35
- So, 8/15 + 5/21 = 27/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15+5/21 8/15+10/21 8/30+5/21 8/15+5/42 24/15+5/21 8/15+15/21 8/45+5/21 8/15+5/63 40/15+5/21 8/15+25/21 8/75+5/21 56/15+5/21 8/15+35/21