Add 80/18 and 54/20
1st number: 4 8/18, 2nd number: 2 14/20
80/18 + 54/20 is 643/90.
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,
80/18 = 80 × 10/18 × 10 = 800/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
54/20 = 54 × 9/20 × 9 = 486/180 - Add the two like fractions:
800/180 + 486/180 = 800 + 486/180 = 1286/180 - 1286/180 simplified gives 643/90
- So, 80/18 + 54/20 = 643/90
In mixed form: 713/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/36+54/20 80/18+54/40 80/54+54/20 80/18+54/60 80/90+54/20