Subtract 40/42 from 8/4
1st number: 2 0/4, 2nd number: 40/42
8/4 - 40/42 is 22/21.
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,
8/4 = 8 × 21/4 × 21 = 168/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
40/42 = 40 × 2/42 × 2 = 80/84 - Subtract the two like fractions:
168/84 - 80/84 = 168 - 80/84 = 88/84 - After reducing the fraction, the answer is 22/21
- In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/4-40/42 8/4-80/42 8/4-40/84 24/4-40/42 8/12-40/42 40/4-40/42 8/20-40/42 56/4-40/42 8/28-40/42