Add 3/21 and 15/10
1st number: 3/21, 2nd number: 1 5/10
3/21 + 15/10 is 23/14.
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,
15/10 = 15 × 21/10 × 21 = 315/210 - Add the two like fractions:
30/210 + 315/210 = 30 + 315/210 = 345/210 - 345/210 simplified gives 23/14
- So, 3/21 + 15/10 = 23/14
In mixed form: 19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+15/10 3/21+30/10 3/42+15/10 3/21+15/20 9/21+15/10 3/21+45/10 3/63+15/10 3/21+15/30 15/21+15/10 3/21+75/10 3/21+15/50 3/21+15/70