Add 21/10 and 18/15
1st number: 2 1/10, 2nd number: 1 3/15
21/10 + 18/15 is 33/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 10 × 3 = 30,
21/10 = 21 × 3/10 × 3 = 63/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
18/15 = 18 × 2/15 × 2 = 36/30 - Add the two like fractions:
63/30 + 36/30 = 63 + 36/30 = 99/30 - 99/30 simplified gives 33/10
- So, 21/10 + 18/15 = 33/10
In mixed form: 33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+18/15 21/10+36/15 21/20+18/15 21/10+18/30 63/10+18/15 21/10+54/15 21/30+18/15 21/10+18/45 21/10+90/15 21/50+18/15 21/10+18/75 21/70+18/15