Subtract 4/20 from 30/8
1st number: 3 6/8, 2nd number: 4/20
30/8 - 4/20 is 71/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
30/8 = 30 × 5/8 × 5 = 150/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
4/20 = 4 × 2/20 × 2 = 8/40 - Subtract the two like fractions:
150/40 - 8/40 = 150 - 8/40 = 142/40 - After reducing the fraction, the answer is 71/20
- In mixed form: 311/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8-4/20 30/8-8/20 30/16-4/20 30/8-4/40 90/8-4/20 30/8-12/20 30/24-4/20 30/8-4/60 30/40-4/20 30/8-28/20 30/56-4/20