Subtract 84/42 from 8/84
1st number: 8/84, 2nd number: 2 0/42
8/84 - 84/42 is -40/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
8/84 = 8 × 1/84 × 1 = 8/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
84/42 = 84 × 2/42 × 2 = 168/84 - Subtract the two like fractions:
8/84 - 168/84 = 8 - 168/84 = -160/84 - After reducing the fraction, the answer is -40/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/84-84/42 24/84-84/42 40/84-84/42 56/84-84/42