Add 12/5 and 21/40
1st number: 2 2/5, 2nd number: 21/40
12/5 + 21/40 is 117/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
12/5 = 12 × 8/5 × 8 = 96/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
96/40 + 21/40 = 96 + 21/40 = 117/40 - So, 12/5 + 21/40 = 117/40
In mixed form: 237/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/5+21/40 12/5+42/40 12/10+21/40 12/5+21/80 36/5+21/40 12/5+63/40 12/15+21/40 60/5+21/40 12/25+21/40 84/5+21/40 12/35+21/40