Subtract 8/21 from 42/2
1st number: 21 0/2, 2nd number: 8/21
42/2 - 8/21 is 433/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
42/2 = 42 × 21/2 × 21 = 882/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
8/21 = 8 × 2/21 × 2 = 16/42 - Subtract the two like fractions:
882/42 - 16/42 = 882 - 16/42 = 866/42 - After reducing the fraction, the answer is 433/21
- In mixed form: 2013/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-8/21 42/2-16/21 42/4-8/21 42/2-8/42 42/2-24/21 42/6-8/21 42/2-8/63 42/2-40/21 42/10-8/21 42/2-56/21 42/14-8/21