Subtract 75/7 from 18/27
1st number: 18/27, 2nd number: 10 5/7
18/27 - 75/7 is -211/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189 - Likewise, for the 2nd fraction, since 7 × 27 = 189,
75/7 = 75 × 27/7 × 27 = 2025/189 - Subtract the two like fractions:
126/189 - 2025/189 = 126 - 2025/189 = -1899/189 - After reducing the fraction, the answer is -211/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27-75/7 18/54-75/7 18/27-75/14 54/27-75/7 18/81-75/7 18/27-75/21 90/27-75/7 18/27-75/35 18/27-75/49