Subtract 8/42 from 20/4
1st number: 5 0/4, 2nd number: 8/42
20/4 - 8/42 is 101/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
20/4 = 20 × 21/4 × 21 = 420/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
8/42 = 8 × 2/42 × 2 = 16/84 - Subtract the two like fractions:
420/84 - 16/84 = 420 - 16/84 = 404/84 - After reducing the fraction, the answer is 101/21
- In mixed form: 417/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/4-8/42 20/4-16/42 20/8-8/42 20/4-8/84 60/4-8/42 20/4-24/42 20/12-8/42 20/4-40/42 20/4-56/42 20/28-8/42