Add 72/15 and 80/42
1st number: 4 12/15, 2nd number: 1 38/42
72/15 + 80/42 is 704/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
72/15 = 72 × 14/15 × 14 = 1008/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
80/42 = 80 × 5/42 × 5 = 400/210 - Add the two like fractions:
1008/210 + 400/210 = 1008 + 400/210 = 1408/210 - 1408/210 simplified gives 704/105
- So, 72/15 + 80/42 = 704/105
In mixed form: 674/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/30+80/42 72/15+80/84 72/45+80/42 72/75+80/42