Add 81/12 and 20/72
1st number: 6 9/12, 2nd number: 20/72
81/12 + 20/72 is 253/36.
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,
81/12 = 81 × 6/12 × 6 = 486/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
20/72 = 20 × 1/72 × 1 = 20/72 - Add the two like fractions:
486/72 + 20/72 = 486 + 20/72 = 506/72 - 506/72 simplified gives 253/36
- So, 81/12 + 20/72 = 253/36
In mixed form: 71/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12+40/72 81/24+20/72 81/12+60/72 81/36+20/72 81/60+20/72 81/84+20/72