Add 72/90 and 54/18
1st number: 72/90, 2nd number: 3 0/18
72/90 + 54/18 is 19/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
72/90 = 72 × 1/90 × 1 = 72/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
54/18 = 54 × 5/18 × 5 = 270/90 - Add the two like fractions:
72/90 + 270/90 = 72 + 270/90 = 342/90 - 342/90 simplified gives 19/5
- So, 72/90 + 54/18 = 19/5
In mixed form: 34/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+54/36 72/90+54/90