Subtract 84/5 from 81/4
1st number: 20 1/4, 2nd number: 16 4/5
81/4 - 84/5 is 69/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
81/4 = 81 × 5/4 × 5 = 405/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
84/5 = 84 × 4/5 × 4 = 336/20 - Subtract the two like fractions:
405/20 - 336/20 = 405 - 336/20 = 69/20 - In mixed form: 39/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/8-84/5 81/4-84/10 81/12-84/5 81/4-84/15 81/20-84/5 81/4-84/25 81/28-84/5 81/4-84/35