Add 54/80 and 21/40
54/80 + 21/40 is 6/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 40 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
54/80 = 54 × 1/80 × 1 = 54/80 - Likewise, for the 2nd fraction, since 40 × 2 = 80,
21/40 = 21 × 2/40 × 2 = 42/80 - Add the two like fractions:
54/80 + 42/80 = 54 + 42/80 = 96/80 - 96/80 simplified gives 6/5
- So, 54/80 + 21/40 = 6/5
In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80+42/40 54/80+21/80 54/80+63/40