Add 5/21 and 8/35
5/21 + 8/35 is 7/15.
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,
5/21 = 5 × 5/21 × 5 = 25/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
8/35 = 8 × 3/35 × 3 = 24/105 - Add the two like fractions:
25/105 + 24/105 = 25 + 24/105 = 49/105 - 49/105 simplified gives 7/15
- So, 5/21 + 8/35 = 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+8/35 5/21+16/35 5/42+8/35 5/21+8/70 15/21+8/35 5/21+24/35 5/63+8/35 25/21+8/35 5/21+40/35 35/21+8/35 5/21+56/35