Subtract 20/10 from 42/8
1st number: 5 2/8, 2nd number: 2 0/10
42/8 - 20/10 is 13/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 10 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 10 × 4 = 40,
20/10 = 20 × 4/10 × 4 = 80/40 - Subtract the two like fractions:
210/40 - 80/40 = 210 - 80/40 = 130/40 - After reducing the fraction, the answer is 13/4
- In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-20/10 42/8-40/10 42/16-20/10 42/8-60/10 42/24-20/10 42/8-20/30 42/40-20/10 42/8-20/50 42/56-20/10 42/8-20/70