Add 15/10 and 7/21
1st number: 1 5/10, 2nd number: 7/21
15/10 + 7/21 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
15/10 = 15 × 21/10 × 21 = 315/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Add the two like fractions:
315/210 + 70/210 = 315 + 70/210 = 385/210 - 385/210 simplified gives 11/6
- So, 15/10 + 7/21 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10+7/21 15/10+14/21 15/20+7/21 15/10+7/42 45/10+7/21 15/30+7/21 15/10+7/63 75/10+7/21 15/10+35/21 15/50+7/21 15/10+49/21 15/70+7/21