Add 42/15 and 80/90
1st number: 2 12/15, 2nd number: 80/90
42/15 + 80/90 is 166/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
42/15 = 42 × 6/15 × 6 = 252/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
80/90 = 80 × 1/90 × 1 = 80/90 - Add the two like fractions:
252/90 + 80/90 = 252 + 80/90 = 332/90 - 332/90 simplified gives 166/45
- So, 42/15 + 80/90 = 166/45
In mixed form: 331/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+80/90 42/30+80/90 42/45+80/90 42/75+80/90