Add 1/21 and 42/36
1st number: 1/21, 2nd number: 1 6/36
1/21 + 42/36 is 17/14.
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,
1/21 = 1 × 12/21 × 12 = 12/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
42/36 = 42 × 7/36 × 7 = 294/252 - Add the two like fractions:
12/252 + 294/252 = 12 + 294/252 = 306/252 - 306/252 simplified gives 17/14
- So, 1/21 + 42/36 = 17/14
In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+42/36 1/21+84/36 1/42+42/36 1/21+42/72 3/21+42/36 1/63+42/36 5/21+42/36 7/21+42/36