Add 15/84 and 80/42
1st number: 15/84, 2nd number: 1 38/42
15/84 + 80/42 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
15/84 = 15 × 1/84 × 1 = 15/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
80/42 = 80 × 2/42 × 2 = 160/84 - Add the two like fractions:
15/84 + 160/84 = 15 + 160/84 = 175/84 - 175/84 simplified gives 25/12
- So, 15/84 + 80/42 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+80/42 15/84+80/84 45/84+80/42 75/84+80/42