Add 21/80 and 9/25
21/80 + 9/25 is 249/400.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 25 is 400
Next, find the equivalent fraction of both fractional numbers with denominator 400 - For the 1st fraction, since 80 × 5 = 400,
21/80 = 21 × 5/80 × 5 = 105/400 - Likewise, for the 2nd fraction, since 25 × 16 = 400,
9/25 = 9 × 16/25 × 16 = 144/400 - Add the two like fractions:
105/400 + 144/400 = 105 + 144/400 = 249/400 - So, 21/80 + 9/25 = 249/400
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+9/25 21/80+18/25 21/80+9/50 63/80+9/25 21/80+27/25 21/80+9/75 21/80+45/25 21/80+63/25