Subtract 4/8 from 42/20
1st number: 2 2/20, 2nd number: 4/8
42/20 - 4/8 is 8/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
42/20 = 42 × 2/20 × 2 = 84/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
4/8 = 4 × 5/8 × 5 = 20/40 - Subtract the two like fractions:
84/40 - 20/40 = 84 - 20/40 = 64/40 - After reducing the fraction, the answer is 8/5
- In mixed form: 13/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-4/8 42/40-4/8 42/20-4/16 42/20-12/8 42/60-4/8 42/20-4/24 42/20-20/8 42/20-4/40 42/20-28/8 42/20-4/56