Subtract 18/5 from 42/8
1st number: 5 2/8, 2nd number: 3 3/5
42/8 - 18/5 is 33/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 5 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
42/8 = 42 × 5/8 × 5 = 210/40 - Likewise, for the 2nd fraction, since 5 × 8 = 40,
18/5 = 18 × 8/5 × 8 = 144/40 - Subtract the two like fractions:
210/40 - 144/40 = 210 - 144/40 = 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: 84/8-18/5 42/8-36/5 42/16-18/5 42/8-18/10 42/8-54/5 42/24-18/5 42/8-18/15 42/8-90/5 42/40-18/5 42/8-18/25 42/56-18/5 42/8-18/35