Add 81/21 and 40/18
1st number: 3 18/21, 2nd number: 2 4/18
81/21 + 40/18 is 383/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
81/21 = 81 × 6/21 × 6 = 486/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126 - Add the two like fractions:
486/126 + 280/126 = 486 + 280/126 = 766/126 - 766/126 simplified gives 383/63
- So, 81/21 + 40/18 = 383/63
In mixed form: 65/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+80/18 81/42+40/18 81/21+40/36 81/63+40/18 81/21+40/54 81/21+40/90