Add 5/40 and 21/12
1st number: 5/40, 2nd number: 1 9/12
5/40 + 21/12 is 15/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
5/40 = 5 × 3/40 × 3 = 15/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
21/12 = 21 × 10/12 × 10 = 210/120 - Add the two like fractions:
15/120 + 210/120 = 15 + 210/120 = 225/120 - 225/120 simplified gives 15/8
- So, 5/40 + 21/12 = 15/8
In mixed form: 17/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40+21/12 5/40+42/12 5/80+21/12 5/40+21/24 15/40+21/12 5/40+63/12 5/40+21/36 25/40+21/12 5/40+21/60 35/40+21/12 5/40+21/84