Add 18/80 and 21/4
1st number: 18/80, 2nd number: 5 1/4
18/80 + 21/4 is 219/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 4 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
18/80 = 18 × 1/80 × 1 = 18/80 - Likewise, for the 2nd fraction, since 4 × 20 = 80,
21/4 = 21 × 20/4 × 20 = 420/80 - Add the two like fractions:
18/80 + 420/80 = 18 + 420/80 = 438/80 - 438/80 simplified gives 219/40
- So, 18/80 + 21/4 = 219/40
In mixed form: 519/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/80+21/4 18/80+42/4 18/80+21/8 54/80+21/4 18/80+63/4 18/80+21/12 90/80+21/4 18/80+21/20 18/80+21/28