Subtract 40/21 from 84/3
1st number: 28 0/3, 2nd number: 1 19/21
84/3 - 40/21 is 548/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
84/3 = 84 × 7/3 × 7 = 588/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
40/21 = 40 × 1/21 × 1 = 40/21 - Subtract the two like fractions:
588/21 - 40/21 = 588 - 40/21 = 548/21 - In mixed form: 262/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/3-80/21 84/6-40/21 84/3-40/42 84/9-40/21 84/3-40/63 84/15-40/21 84/21-40/21