Add 81/18 and 54/45
1st number: 4 9/18, 2nd number: 1 9/45
81/18 + 54/45 is 57/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
81/18 = 81 × 5/18 × 5 = 405/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
54/45 = 54 × 2/45 × 2 = 108/90 - Add the two like fractions:
405/90 + 108/90 = 405 + 108/90 = 513/90 - 513/90 simplified gives 57/10
- So, 81/18 + 54/45 = 57/10
In mixed form: 57/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/36+54/45 81/18+54/90 81/54+54/45 81/90+54/45