Subtract 12/80 from 21/4
1st number: 5 1/4, 2nd number: 12/80
21/4 - 12/80 is 51/10.
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,
12/80 = 12 × 1/80 × 1 = 12/80 - Subtract the two like fractions:
420/80 - 12/80 = 420 - 12/80 = 408/80 - After reducing the fraction, the answer is 51/10
- In mixed form: 51/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-12/80 21/4-24/80 21/8-12/80 63/4-12/80 21/4-36/80 21/12-12/80 21/4-60/80 21/20-12/80 21/4-84/80 21/28-12/80