Add 20/12 and 81/72
1st number: 1 8/12, 2nd number: 1 9/72
20/12 + 81/72 is 67/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 12 × 6 = 72,
20/12 = 20 × 6/12 × 6 = 120/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
81/72 = 81 × 1/72 × 1 = 81/72 - Add the two like fractions:
120/72 + 81/72 = 120 + 81/72 = 201/72 - 201/72 simplified gives 67/24
- So, 20/12 + 81/72 = 67/24
In mixed form: 219/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+81/72 20/24+81/72 60/12+81/72 20/36+81/72 20/60+81/72 20/84+81/72