Add 21/8 and 28/80
1st number: 2 5/8, 2nd number: 28/80
21/8 + 28/80 is 119/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 8 × 10 = 80,
21/8 = 21 × 10/8 × 10 = 210/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
28/80 = 28 × 1/80 × 1 = 28/80 - Add the two like fractions:
210/80 + 28/80 = 210 + 28/80 = 238/80 - 238/80 simplified gives 119/40
- So, 21/8 + 28/80 = 119/40
In mixed form: 239/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+28/80 21/8+56/80 21/16+28/80 63/8+28/80 21/8+84/80 21/24+28/80 21/40+28/80 21/56+28/80