Add 21/42 and 81/35
1st number: 21/42, 2nd number: 2 11/35
21/42 + 81/35 is 197/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
81/35 = 81 × 6/35 × 6 = 486/210 - Add the two like fractions:
105/210 + 486/210 = 105 + 486/210 = 591/210 - 591/210 simplified gives 197/70
- So, 21/42 + 81/35 = 197/70
In mixed form: 257/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84+81/35 21/42+81/70 63/42+81/35