Subtract 48/54 from 42/21
1st number: 2 0/21, 2nd number: 48/54
42/21 - 48/54 is 10/9.
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,
42/21 = 42 × 18/21 × 18 = 756/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
48/54 = 48 × 7/54 × 7 = 336/378 - Subtract the two like fractions:
756/378 - 336/378 = 756 - 336/378 = 420/378 - After reducing the fraction, the answer is 10/9
- In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-48/54 42/21-96/54 42/63-48/54