Add 15/12 and 84/42
1st number: 1 3/12, 2nd number: 2 0/42
15/12 + 84/42 is 13/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 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 42 × 2 = 84,
84/42 = 84 × 2/42 × 2 = 168/84 - Add the two like fractions:
105/84 + 168/84 = 105 + 168/84 = 273/84 - 273/84 simplified gives 13/4
- So, 15/12 + 84/42 = 13/4
In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+84/42 15/24+84/42 45/12+84/42 15/36+84/42 75/12+84/42 15/60+84/42 15/84+84/42