Subtract 42/20 from 30/8
1st number: 3 6/8, 2nd number: 2 2/20
30/8 - 42/20 is 33/20.
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,
42/20 = 42 × 2/20 × 2 = 84/40 - Subtract the two like fractions:
150/40 - 84/40 = 150 - 84/40 = 66/40 - After reducing the fraction, the answer is 33/20
- In mixed form: 113/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8-42/20 30/8-84/20 30/16-42/20 30/8-42/40 90/8-42/20 30/24-42/20 30/8-42/60 30/40-42/20 30/56-42/20