Add 21/10 and 63/18
1st number: 2 1/10, 2nd number: 3 9/18
21/10 + 63/18 is 28/5.
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,
21/10 = 21 × 9/10 × 9 = 189/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
63/18 = 63 × 5/18 × 5 = 315/90 - Add the two like fractions:
189/90 + 315/90 = 189 + 315/90 = 504/90 - 504/90 simplified gives 28/5
- So, 21/10 + 63/18 = 28/5
In mixed form: 53/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+63/18 21/20+63/18 21/10+63/36 63/10+63/18 21/30+63/18 21/10+63/54 21/50+63/18 21/10+63/90 21/70+63/18