Add 72/18 and 81/90
1st number: 4 0/18, 2nd number: 81/90
72/18 + 81/90 is 49/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 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 90 × 1 = 90,
81/90 = 81 × 1/90 × 1 = 81/90 - Add the two like fractions:
360/90 + 81/90 = 360 + 81/90 = 441/90 - 441/90 simplified gives 49/10
- So, 72/18 + 81/90 = 49/10
In mixed form: 49/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+81/90 72/54+81/90 72/90+81/90