Add 7/10 and 21/18
1st number: 7/10, 2nd number: 1 3/18
7/10 + 21/18 is 28/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
7/10 = 7 × 9/10 × 9 = 63/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Add the two like fractions:
63/90 + 105/90 = 63 + 105/90 = 168/90 - 168/90 simplified gives 28/15
- So, 7/10 + 21/18 = 28/15
In mixed form: 113/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/10+21/18 7/10+42/18 7/20+21/18 7/10+21/36 21/10+21/18 7/10+63/18 7/30+21/18 7/10+21/54 35/10+21/18 7/50+21/18 7/10+21/90 49/10+21/18 7/70+21/18