Add 81/90 and 12/18
81/90 + 12/18 is 47/30.
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,
81/90 = 81 × 1/90 × 1 = 81/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
12/18 = 12 × 5/18 × 5 = 60/90 - Add the two like fractions:
81/90 + 60/90 = 81 + 60/90 = 141/90 - 141/90 simplified gives 47/30
- So, 81/90 + 12/18 = 47/30
In mixed form: 117/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/90+24/18 81/90+12/36 81/90+36/18 81/90+12/54 81/90+60/18 81/90+12/90 81/90+84/18