Add 42/21 and 49/15
1st number: 2 0/21, 2nd number: 3 4/15
42/21 + 49/15 is 79/15.
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,
42/21 = 42 × 5/21 × 5 = 210/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
49/15 = 49 × 7/15 × 7 = 343/105 - Add the two like fractions:
210/105 + 343/105 = 210 + 343/105 = 553/105 - 553/105 simplified gives 79/15
- So, 42/21 + 49/15 = 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: 84/21+49/15 42/21+98/15 42/21+49/30 42/63+49/15 42/21+49/45 42/21+49/75