Add 21/40 and 40/3
1st number: 21/40, 2nd number: 13 1/3
21/40 + 40/3 is 1663/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 3 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 3 × 40 = 120,
40/3 = 40 × 40/3 × 40 = 1600/120 - Add the two like fractions:
63/120 + 1600/120 = 63 + 1600/120 = 1663/120 - So, 21/40 + 40/3 = 1663/120
In mixed form: 13103/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+40/3 21/40+80/3 21/80+40/3 21/40+40/6 63/40+40/3 21/40+40/9 21/40+40/15 21/40+40/21