Add 72/36 and 9/21
1st number: 2 0/36, 2nd number: 9/21
72/36 + 9/21 is 17/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
72/36 = 72 × 7/36 × 7 = 504/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
9/21 = 9 × 12/21 × 12 = 108/252 - Add the two like fractions:
504/252 + 108/252 = 504 + 108/252 = 612/252 - 612/252 simplified gives 17/7
- So, 72/36 + 9/21 = 17/7
In mixed form: 23/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+18/21 72/36+9/42 72/36+27/21 72/36+9/63 72/36+45/21 72/36+63/21