Subtract 20/21 from 12/4
1st number: 3 0/4, 2nd number: 20/21
12/4 - 20/21 is 43/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
12/4 = 12 × 21/4 × 21 = 252/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Subtract the two like fractions:
252/84 - 80/84 = 252 - 80/84 = 172/84 - After reducing the fraction, the answer is 43/21
- In mixed form: 21/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4-20/21 12/4-40/21 12/8-20/21 12/4-20/42 36/4-20/21 12/4-60/21 12/4-20/63 60/4-20/21 12/20-20/21 84/4-20/21 12/28-20/21