Subtract 84/27 from 40/21
1st number: 1 19/21, 2nd number: 3 3/27
40/21 - 84/27 is -76/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
40/21 = 40 × 9/21 × 9 = 360/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
84/27 = 84 × 7/27 × 7 = 588/189 - Subtract the two like fractions:
360/189 - 588/189 = 360 - 588/189 = -228/189 - After reducing the fraction, the answer is -76/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-84/27 40/42-84/27 40/21-84/54 40/63-84/27 40/21-84/81