Subtract 21/4 from 75/20
1st number: 3 15/20, 2nd number: 5 1/4
75/20 - 21/4 is -3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 4 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
75/20 = 75 × 1/20 × 1 = 75/20 - Likewise, for the 2nd fraction, since 4 × 5 = 20,
21/4 = 21 × 5/4 × 5 = 105/20 - Subtract the two like fractions:
75/20 - 105/20 = 75 - 105/20 = -30/20 - After reducing the fraction, the answer is -3/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/20-42/4 75/40-21/4 75/20-21/8 75/20-63/4 75/60-21/4 75/20-21/12 75/20-21/20 75/20-21/28