Add 45/12 and 21/10
1st number: 3 9/12, 2nd number: 2 1/10
45/12 + 21/10 is 117/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
21/10 = 21 × 6/10 × 6 = 126/60 - Add the two like fractions:
225/60 + 126/60 = 225 + 126/60 = 351/60 - 351/60 simplified gives 117/20
- So, 45/12 + 21/10 = 117/20
In mixed form: 517/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+21/10 45/12+42/10 45/24+21/10 45/12+21/20 45/12+63/10 45/36+21/10 45/12+21/30 45/60+21/10 45/12+21/50 45/84+21/10 45/12+21/70