Add 7/21 and 42/36
1st number: 7/21, 2nd number: 1 6/36
7/21 + 42/36 is 3/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
7/21 = 7 × 12/21 × 12 = 84/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
42/36 = 42 × 7/36 × 7 = 294/252 - Add the two like fractions:
84/252 + 294/252 = 84 + 294/252 = 378/252 - 378/252 simplified gives 3/2
- So, 7/21 + 42/36 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+42/36 7/21+84/36 7/42+42/36 7/21+42/72 7/63+42/36 35/21+42/36 49/21+42/36