Add 40/21 and 9/18
1st number: 1 19/21, 2nd number: 9/18
40/21 + 9/18 is 101/42.
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,
40/21 = 40 × 6/21 × 6 = 240/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
9/18 = 9 × 7/18 × 7 = 63/126 - Add the two like fractions:
240/126 + 63/126 = 240 + 63/126 = 303/126 - 303/126 simplified gives 101/42
- So, 40/21 + 9/18 = 101/42
In mixed form: 217/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+9/18 40/42+9/18 40/21+9/36 40/21+27/18 40/63+9/18 40/21+9/54 40/21+45/18 40/21+9/90 40/21+63/18