Subtract 9/54 from 42/21
1st number: 2 0/21, 2nd number: 9/54
42/21 - 9/54 is 11/6.
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,
9/54 = 9 × 7/54 × 7 = 63/378 - Subtract the two like fractions:
756/378 - 63/378 = 756 - 63/378 = 693/378 - After reducing the fraction, the answer is 11/6
- In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-9/54 42/21-18/54 42/21-27/54 42/63-9/54 42/21-45/54 42/21-63/54