Add 21/15 and 18/35
1st number: 1 6/15, 2nd number: 18/35
21/15 + 18/35 is 67/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
21/15 = 21 × 7/15 × 7 = 147/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
18/35 = 18 × 3/35 × 3 = 54/105 - Add the two like fractions:
147/105 + 54/105 = 147 + 54/105 = 201/105 - 201/105 simplified gives 67/35
- So, 21/15 + 18/35 = 67/35
In mixed form: 132/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+18/35 21/15+36/35 21/30+18/35 21/15+18/70 63/15+18/35 21/15+54/35 21/45+18/35 21/15+90/35 21/75+18/35