Subtract 12/21 from 20/4
1st number: 5 0/4, 2nd number: 12/21
20/4 - 12/21 is 31/7.
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,
20/4 = 20 × 21/4 × 21 = 420/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
12/21 = 12 × 4/21 × 4 = 48/84 - Subtract the two like fractions:
420/84 - 48/84 = 420 - 48/84 = 372/84 - After reducing the fraction, the answer is 31/7
- In mixed form: 43/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/4-12/21 20/4-24/21 20/8-12/21 20/4-12/42 60/4-12/21 20/4-36/21 20/12-12/21 20/4-12/63 20/4-60/21 20/4-84/21 20/28-12/21