Add 21/18 and 21/10
1st number: 1 3/18, 2nd number: 2 1/10
21/18 + 21/10 is 49/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Add the two like fractions:
105/90 + 189/90 = 105 + 189/90 = 294/90 - 294/90 simplified gives 49/15
- So, 21/18 + 21/10 = 49/15
In mixed form: 34/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+21/10 21/18+42/10 21/36+21/10 21/18+21/20 63/18+21/10 21/18+63/10 21/54+21/10 21/18+21/30 21/90+21/10 21/18+21/50 21/18+21/70