Add 21/30 and 81/35
1st number: 21/30, 2nd number: 2 11/35
21/30 + 81/35 is 211/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
81/35 = 81 × 6/35 × 6 = 486/210 - Add the two like fractions:
147/210 + 486/210 = 147 + 486/210 = 633/210 - 633/210 simplified gives 211/70
- So, 21/30 + 81/35 = 211/70
In mixed form: 31/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+81/35 21/60+81/35 21/30+81/70 63/30+81/35 21/90+81/35