Add 40/21 and 15/12
1st number: 1 19/21, 2nd number: 1 3/12
40/21 + 15/12 is 265/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
40/21 = 40 × 4/21 × 4 = 160/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
15/12 = 15 × 7/12 × 7 = 105/84 - Add the two like fractions:
160/84 + 105/84 = 160 + 105/84 = 265/84 - So, 40/21 + 15/12 = 265/84
In mixed form: 313/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+15/12 40/21+30/12 40/42+15/12 40/21+15/24 40/21+45/12 40/63+15/12 40/21+15/36 40/21+75/12 40/21+15/60 40/21+15/84