Subtract 6/9 from 40/84
40/84 - 6/9 is -4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
40/84 = 40 × 3/84 × 3 = 120/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
6/9 = 6 × 28/9 × 28 = 168/252 - Subtract the two like fractions:
120/252 - 168/252 = 120 - 168/252 = -48/252 - After reducing the fraction, the answer is -4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-6/9 40/84-12/9 40/84-6/18 40/84-18/9 40/84-6/27 40/84-30/9 40/84-6/45 40/84-42/9 40/84-6/63