Subtract 20/27 from 40/70
40/70 - 20/27 is -32/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 70 × 27 = 1890,
40/70 = 40 × 27/70 × 27 = 1080/1890 - Likewise, for the 2nd fraction, since 27 × 70 = 1890,
20/27 = 20 × 70/27 × 70 = 1400/1890 - Subtract the two like fractions:
1080/1890 - 1400/1890 = 1080 - 1400/1890 = -320/1890 - After reducing the fraction, the answer is -32/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70-20/27 40/70-40/27 40/70-20/54 40/70-60/27 40/70-20/81