Add 40/21 and 18/36
1st number: 1 19/21, 2nd number: 18/36
40/21 + 18/36 is 101/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
40/21 = 40 × 12/21 × 12 = 480/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Add the two like fractions:
480/252 + 126/252 = 480 + 126/252 = 606/252 - 606/252 simplified gives 101/42
- So, 40/21 + 18/36 = 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+18/36 40/42+18/36 40/21+18/72 40/21+54/36 40/63+18/36 40/21+90/36