Add 9/15 and 42/80
9/15 + 42/80 is 9/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
9/15 = 9 × 16/15 × 16 = 144/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240 - Add the two like fractions:
144/240 + 126/240 = 144 + 126/240 = 270/240 - 270/240 simplified gives 9/8
- So, 9/15 + 42/80 = 9/8
In mixed form: 11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+42/80 9/15+84/80 9/30+42/80 27/15+42/80 9/45+42/80 45/15+42/80 9/75+42/80 63/15+42/80