Add 15/12 and 45/21
1st number: 1 3/12, 2nd number: 2 3/21
15/12 + 45/21 is 95/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
15/12 = 15 × 7/12 × 7 = 105/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Add the two like fractions:
105/84 + 180/84 = 105 + 180/84 = 285/84 - 285/84 simplified gives 95/28
- So, 15/12 + 45/21 = 95/28
In mixed form: 311/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+45/21 15/12+90/21 15/24+45/21 15/12+45/42 45/12+45/21 15/36+45/21 15/12+45/63 75/12+45/21 15/60+45/21 15/84+45/21