Add 72/21 and 42/36
1st number: 3 9/21, 2nd number: 1 6/36
72/21 + 42/36 is 193/42.
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,
72/21 = 72 × 12/21 × 12 = 864/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
42/36 = 42 × 7/36 × 7 = 294/252 - Add the two like fractions:
864/252 + 294/252 = 864 + 294/252 = 1158/252 - 1158/252 simplified gives 193/42
- So, 72/21 + 42/36 = 193/42
In mixed form: 425/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+84/36 72/42+42/36 72/21+42/72 72/63+42/36