Add 18/20 and 54/80
18/20 + 54/80 is 63/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
18/20 = 18 × 4/20 × 4 = 72/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
54/80 = 54 × 1/80 × 1 = 54/80 - Add the two like fractions:
72/80 + 54/80 = 72 + 54/80 = 126/80 - 126/80 simplified gives 63/40
- So, 18/20 + 54/80 = 63/40
In mixed form: 123/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+54/80 18/40+54/80 54/20+54/80 18/60+54/80 90/20+54/80