Subtract 30/5 from 21/4
1st number: 5 1/4, 2nd number: 6 0/5
21/4 - 30/5 is -3/4.
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,
21/4 = 21 × 5/4 × 5 = 105/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
30/5 = 30 × 4/5 × 4 = 120/20 - Subtract the two like fractions:
105/20 - 120/20 = 105 - 120/20 = -15/20 - After reducing the fraction, the answer is -3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-30/5 21/4-60/5 21/8-30/5 21/4-30/10 63/4-30/5 21/4-90/5 21/12-30/5 21/4-30/15 21/20-30/5 21/4-30/25 21/28-30/5 21/4-30/35