Add 21/10 and 15/90
1st number: 2 1/10, 2nd number: 15/90
21/10 + 15/90 is 34/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
15/90 = 15 × 1/90 × 1 = 15/90 - Add the two like fractions:
189/90 + 15/90 = 189 + 15/90 = 204/90 - 204/90 simplified gives 34/15
- So, 21/10 + 15/90 = 34/15
In mixed form: 24/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+15/90 21/10+30/90 21/20+15/90 63/10+15/90 21/10+45/90 21/30+15/90 21/10+75/90 21/50+15/90 21/70+15/90