Subtract 9/80 from 21/4
1st number: 5 1/4, 2nd number: 9/80
21/4 - 9/80 is 411/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 4 × 20 = 80,
21/4 = 21 × 20/4 × 20 = 420/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
9/80 = 9 × 1/80 × 1 = 9/80 - Subtract the two like fractions:
420/80 - 9/80 = 420 - 9/80 = 411/80 - In mixed form: 511/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-9/80 21/4-18/80 21/8-9/80 63/4-9/80 21/4-27/80 21/12-9/80 21/4-45/80 21/20-9/80 21/4-63/80 21/28-9/80