Add 7/15 and 42/84
7/15 + 42/84 is 29/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
7/15 = 7 × 28/15 × 28 = 196/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
42/84 = 42 × 5/84 × 5 = 210/420 - Add the two like fractions:
196/420 + 210/420 = 196 + 210/420 = 406/420 - 406/420 simplified gives 29/30
- So, 7/15 + 42/84 = 29/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15+42/84 7/30+42/84 21/15+42/84 7/45+42/84 35/15+42/84 7/75+42/84 49/15+42/84