Subtract 20/27 from 40/84
40/84 - 20/27 is -50/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 27 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 84 × 9 = 756,
40/84 = 40 × 9/84 × 9 = 360/756 - Likewise, for the 2nd fraction, since 27 × 28 = 756,
20/27 = 20 × 28/27 × 28 = 560/756 - Subtract the two like fractions:
360/756 - 560/756 = 360 - 560/756 = -200/756 - After reducing the fraction, the answer is -50/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-20/27 40/84-40/27 40/84-20/54 40/84-60/27 40/84-20/81