Subtract 21/24 from 40/84
40/84 - 21/24 is -67/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
40/84 = 40 × 2/84 × 2 = 80/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
21/24 = 21 × 7/24 × 7 = 147/168 - Subtract the two like fractions:
80/168 - 147/168 = 80 - 147/168 = -67/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-21/24 40/84-42/24 40/84-21/48 40/84-63/24 40/84-21/72