Subtract 84/20 from 56/21
1st number: 2 14/21, 2nd number: 4 4/20
56/21 - 84/20 is -23/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
56/21 = 56 × 20/21 × 20 = 1120/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
84/20 = 84 × 21/20 × 21 = 1764/420 - Subtract the two like fractions:
1120/420 - 1764/420 = 1120 - 1764/420 = -644/420 - After reducing the fraction, the answer is -23/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-84/20 56/21-84/40 56/63-84/20 56/21-84/60