Add 21/5 and 40/12
1st number: 4 1/5, 2nd number: 3 4/12
21/5 + 40/12 is 113/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 5 × 12 = 60,
21/5 = 21 × 12/5 × 12 = 252/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
40/12 = 40 × 5/12 × 5 = 200/60 - Add the two like fractions:
252/60 + 200/60 = 252 + 200/60 = 452/60 - 452/60 simplified gives 113/15
- So, 21/5 + 40/12 = 113/15
In mixed form: 78/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+40/12 21/5+80/12 21/10+40/12 21/5+40/24 63/5+40/12 21/15+40/12 21/5+40/36 21/25+40/12 21/5+40/60 21/35+40/12 21/5+40/84