Subtract 81/18 from 56/42
1st number: 1 14/42, 2nd number: 4 9/18
56/42 - 81/18 is -19/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
56/42 = 56 × 3/42 × 3 = 168/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
81/18 = 81 × 7/18 × 7 = 567/126 - Subtract the two like fractions:
168/126 - 567/126 = 168 - 567/126 = -399/126 - After reducing the fraction, the answer is -19/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84-81/18 56/42-81/36 56/42-81/54 56/42-81/90