Subtract 20/42 from 75/54
1st number: 1 21/54, 2nd number: 20/42
75/54 - 20/42 is 115/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
75/54 = 75 × 7/54 × 7 = 525/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
20/42 = 20 × 9/42 × 9 = 180/378 - Subtract the two like fractions:
525/378 - 180/378 = 525 - 180/378 = 345/378 - After reducing the fraction, the answer is 115/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/54-40/42 75/54-20/84 75/54-60/42