Subtract 1/81 from 75/42
1st number: 1 33/42, 2nd number: 1/81
75/42 - 1/81 is 2011/1134.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
75/42 = 75 × 27/42 × 27 = 2025/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
1/81 = 1 × 14/81 × 14 = 14/1134 - Subtract the two like fractions:
2025/1134 - 14/1134 = 2025 - 14/1134 = 2011/1134 - In mixed form: 1877/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/42-2/81 75/84-1/81 75/42-3/81 75/42-5/81 75/42-7/81