Add 35/15 and 8/21
1st number: 2 5/15, 2nd number: 8/21
35/15 + 8/21 is 19/7.
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,
35/15 = 35 × 7/15 × 7 = 245/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
8/21 = 8 × 5/21 × 5 = 40/105 - Add the two like fractions:
245/105 + 40/105 = 245 + 40/105 = 285/105 - 285/105 simplified gives 19/7
- So, 35/15 + 8/21 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/15+8/21 35/15+16/21 35/30+8/21 35/15+8/42 35/15+24/21 35/45+8/21 35/15+8/63 35/15+40/21 35/75+8/21 35/15+56/21