Add 72/90 and 81/36
1st number: 72/90, 2nd number: 2 9/36
72/90 + 81/36 is 61/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
72/90 = 72 × 2/90 × 2 = 144/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
81/36 = 81 × 5/36 × 5 = 405/180 - Add the two like fractions:
144/180 + 405/180 = 144 + 405/180 = 549/180 - 549/180 simplified gives 61/20
- So, 72/90 + 81/36 = 61/20
In mixed form: 31/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+81/72