Add 81/18 and 30/72
1st number: 4 9/18, 2nd number: 30/72
81/18 + 30/72 is 59/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
81/18 = 81 × 4/18 × 4 = 324/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
30/72 = 30 × 1/72 × 1 = 30/72 - Add the two like fractions:
324/72 + 30/72 = 324 + 30/72 = 354/72 - 354/72 simplified gives 59/12
- So, 81/18 + 30/72 = 59/12
In mixed form: 411/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+60/72 81/36+30/72 81/18+90/72 81/54+30/72 81/90+30/72