Add 49/15 and 42/21
1st number: 3 4/15, 2nd number: 2 0/21
49/15 + 42/21 is 79/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
49/15 = 49 × 7/15 × 7 = 343/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
42/21 = 42 × 5/21 × 5 = 210/105 - Add the two like fractions:
343/105 + 210/105 = 343 + 210/105 = 553/105 - 553/105 simplified gives 79/15
- So, 49/15 + 42/21 = 79/15
In mixed form: 54/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/15+42/21 49/15+84/21 49/30+42/21 49/45+42/21 49/15+42/63 49/75+42/21