Subtract 20/5 from 30/4
1st number: 7 2/4, 2nd number: 4 0/5
30/4 - 20/5 is 7/2.
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,
30/4 = 30 × 5/4 × 5 = 150/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
20/5 = 20 × 4/5 × 4 = 80/20 - Subtract the two like fractions:
150/20 - 80/20 = 150 - 80/20 = 70/20 - After reducing the fraction, the answer is 7/2
- In mixed form: 31/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4-20/5 30/4-40/5 30/8-20/5 30/4-20/10 90/4-20/5 30/4-60/5 30/12-20/5 30/4-20/15 30/20-20/5 30/4-20/25 30/28-20/5 30/4-20/35