Add 81/21 and 18/30
1st number: 3 18/21, 2nd number: 18/30
81/21 + 18/30 is 156/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
81/21 = 81 × 10/21 × 10 = 810/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Add the two like fractions:
810/210 + 126/210 = 810 + 126/210 = 936/210 - 936/210 simplified gives 156/35
- So, 81/21 + 18/30 = 156/35
In mixed form: 416/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+36/30 81/42+18/30 81/21+18/60 81/21+54/30 81/63+18/30 81/21+18/90 81/21+90/30