Add 21/40 and 81/3
1st number: 21/40, 2nd number: 27 0/3
21/40 + 81/3 is 1101/40.
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,
81/3 = 81 × 40/3 × 40 = 3240/120 - Add the two like fractions:
63/120 + 3240/120 = 63 + 3240/120 = 3303/120 - 3303/120 simplified gives 1101/40
- So, 21/40 + 81/3 = 1101/40
In mixed form: 2721/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+81/3 21/80+81/3 21/40+81/6 63/40+81/3 21/40+81/9 21/40+81/15 21/40+81/21