Subtract 54/42 from 20/75
1st number: 20/75, 2nd number: 1 12/42
20/75 - 54/42 is -107/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 42 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 75 × 14 = 1050,
20/75 = 20 × 14/75 × 14 = 280/1050 - Likewise, for the 2nd fraction, since 42 × 25 = 1050,
54/42 = 54 × 25/42 × 25 = 1350/1050 - Subtract the two like fractions:
280/1050 - 1350/1050 = 280 - 1350/1050 = -1070/1050 - After reducing the fraction, the answer is -107/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75-54/42 20/75-54/84 60/75-54/42