Add 72/36 and 21/12
1st number: 2 0/36, 2nd number: 1 9/12
72/36 + 21/12 is 15/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 36 × 1 = 36,
72/36 = 72 × 1/36 × 1 = 72/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Add the two like fractions:
72/36 + 63/36 = 72 + 63/36 = 135/36 - 135/36 simplified gives 15/4
- So, 72/36 + 21/12 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+42/12 72/36+21/24 72/36+63/12 72/36+21/36 72/36+21/60 72/36+21/84