Add 49/21 and 42/15
1st number: 2 7/21, 2nd number: 2 12/15
49/21 + 42/15 is 77/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
49/21 = 49 × 5/21 × 5 = 245/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
42/15 = 42 × 7/15 × 7 = 294/105 - Add the two like fractions:
245/105 + 294/105 = 245 + 294/105 = 539/105 - 539/105 simplified gives 77/15
- So, 49/21 + 42/15 = 77/15
In mixed form: 52/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/21+42/15 49/21+84/15 49/42+42/15 49/21+42/30 49/63+42/15 49/21+42/45 49/21+42/75