Subtract 2/4 from 10/21
10/21 - 2/4 is -1/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
2/4 = 2 × 21/4 × 21 = 42/84 - Subtract the two like fractions:
40/84 - 42/84 = 40 - 42/84 = -2/84 - After reducing the fraction, the answer is -1/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-2/4 10/42-2/4 10/21-2/8 30/21-2/4 10/21-6/4 10/63-2/4 10/21-2/12 50/21-2/4 10/21-10/4 10/21-2/20 70/21-2/4 10/21-14/4 10/21-2/28