Add 3/21 and 9/10
3/21 + 9/10 is 73/70.
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,
3/21 = 3 × 10/21 × 10 = 30/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
9/10 = 9 × 21/10 × 21 = 189/210 - Add the two like fractions:
30/210 + 189/210 = 30 + 189/210 = 219/210 - 219/210 simplified gives 73/70
- So, 3/21 + 9/10 = 73/70
In mixed form: 13/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+9/10 3/21+18/10 3/42+9/10 3/21+9/20 9/21+9/10 3/21+27/10 3/63+9/10 3/21+9/30 15/21+9/10 3/21+45/10 3/21+9/50 3/21+63/10 3/21+9/70