Add 81/18 and 5/20
1st number: 4 9/18, 2nd number: 5/20
81/18 + 5/20 is 19/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
81/18 = 81 × 10/18 × 10 = 810/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
5/20 = 5 × 9/20 × 9 = 45/180 - Add the two like fractions:
810/180 + 45/180 = 810 + 45/180 = 855/180 - 855/180 simplified gives 19/4
- So, 81/18 + 5/20 = 19/4
In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+10/20 81/36+5/20 81/18+5/40 81/18+15/20 81/54+5/20 81/18+5/60 81/18+25/20 81/90+5/20 81/18+35/20