Subtract 4/5 from 42/8
1st number: 5 2/8, 2nd number: 4/5
42/8 - 4/5 is 89/20.
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,
4/5 = 4 × 8/5 × 8 = 32/40 - Subtract the two like fractions:
210/40 - 32/40 = 210 - 32/40 = 178/40 - After reducing the fraction, the answer is 89/20
- In mixed form: 49/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-4/5 42/8-8/5 42/16-4/5 42/8-4/10 42/8-12/5 42/24-4/5 42/8-4/15 42/8-20/5 42/40-4/5 42/8-4/25 42/8-28/5 42/56-4/5 42/8-4/35