Add 84/21 and 40/18
1st number: 4 0/21, 2nd number: 2 4/18
84/21 + 40/18 is 56/9.
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,
84/21 = 84 × 6/21 × 6 = 504/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126 - Add the two like fractions:
504/126 + 280/126 = 504 + 280/126 = 784/126 - 784/126 simplified gives 56/9
- So, 84/21 + 40/18 = 56/9
In mixed form: 62/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+80/18 84/42+40/18 84/21+40/36 84/63+40/18 84/21+40/54 84/21+40/90