Add 80/15 and 70/42
1st number: 5 5/15, 2nd number: 1 28/42
80/15 + 70/42 is 7/1.
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,
80/15 = 80 × 14/15 × 14 = 1120/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
70/42 = 70 × 5/42 × 5 = 350/210 - Add the two like fractions:
1120/210 + 350/210 = 1120 + 350/210 = 1470/210 - 1470/210 simplified gives 7/1
- So, 80/15 + 70/42 = 7/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30+70/42 80/15+70/84 80/45+70/42 80/75+70/42