Add 81/21 and 2/10
1st number: 3 18/21, 2nd number: 2/10
81/21 + 2/10 is 142/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 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 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Add the two like fractions:
810/210 + 42/210 = 810 + 42/210 = 852/210 - 852/210 simplified gives 142/35
- So, 81/21 + 2/10 = 142/35
In mixed form: 42/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+4/10 81/42+2/10 81/21+2/20 81/21+6/10 81/63+2/10 81/21+2/30 81/21+2/50 81/21+14/10 81/21+2/70