Add 72/18 and 81/30
1st number: 4 0/18, 2nd number: 2 21/30
72/18 + 81/30 is 67/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
72/18 = 72 × 5/18 × 5 = 360/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
81/30 = 81 × 3/30 × 3 = 243/90 - Add the two like fractions:
360/90 + 243/90 = 360 + 243/90 = 603/90 - 603/90 simplified gives 67/10
- So, 72/18 + 81/30 = 67/10
In mixed form: 67/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+81/30 72/18+81/60 72/54+81/30 72/18+81/90 72/90+81/30