Subtract 24/7 from 21/42
1st number: 21/42, 2nd number: 3 3/7
21/42 - 24/7 is -41/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
24/7 = 24 × 6/7 × 6 = 144/42 - Subtract the two like fractions:
21/42 - 144/42 = 21 - 144/42 = -123/42 - After reducing the fraction, the answer is -41/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42-48/7 21/84-24/7 21/42-24/14 63/42-24/7 21/42-72/7 21/42-24/21 21/42-24/35 21/42-24/49