Add 81/72 and 36/18
1st number: 1 9/72, 2nd number: 2 0/18
81/72 + 36/18 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 72 × 1 = 72,
81/72 = 81 × 1/72 × 1 = 81/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
36/18 = 36 × 4/18 × 4 = 144/72 - Add the two like fractions:
81/72 + 144/72 = 81 + 144/72 = 225/72 - 225/72 simplified gives 25/8
- So, 81/72 + 36/18 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/72+72/18 81/72+36/54 81/72+36/90