Subtract 8/24 from 40/42
40/42 - 8/24 is 13/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
40/42 = 40 × 4/42 × 4 = 160/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
8/24 = 8 × 7/24 × 7 = 56/168 - Subtract the two like fractions:
160/168 - 56/168 = 160 - 56/168 = 104/168 - After reducing the fraction, the answer is 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42-8/24 40/42-16/24 40/84-8/24 40/42-8/48 40/42-8/72 40/42-40/24 40/42-56/24