Add 7/21 and 7/35
7/21 + 7/35 is 8/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
7/21 = 7 × 5/21 × 5 = 35/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
7/35 = 7 × 3/35 × 3 = 21/105 - Add the two like fractions:
35/105 + 21/105 = 35 + 21/105 = 56/105 - 56/105 simplified gives 8/15
- So, 7/21 + 7/35 = 8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+7/35 7/21+14/35 7/42+7/35 7/21+7/70 7/21+21/35 7/63+7/35 35/21+7/35 49/21+7/35 7/21+49/35