Subtract 24/40 from 20/84
20/84 - 24/40 is -38/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
20/84 = 20 × 10/84 × 10 = 200/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
24/40 = 24 × 21/40 × 21 = 504/840 - Subtract the two like fractions:
200/840 - 504/840 = 200 - 504/840 = -304/840 - After reducing the fraction, the answer is -38/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84-24/40 20/84-48/40 20/84-24/80 60/84-24/40 20/84-72/40