Subtract 24/54 from 81/21
1st number: 3 18/21, 2nd number: 24/54
81/21 - 24/54 is 215/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
81/21 = 81 × 18/21 × 18 = 1458/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
24/54 = 24 × 7/54 × 7 = 168/378 - Subtract the two like fractions:
1458/378 - 168/378 = 1458 - 168/378 = 1290/378 - After reducing the fraction, the answer is 215/63
- In mixed form: 326/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21-48/54 81/42-24/54 81/21-72/54 81/63-24/54