Subtract 9/54 from 10/21
10/21 - 9/54 is 13/42.
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,
10/21 = 10 × 18/21 × 18 = 180/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
9/54 = 9 × 7/54 × 7 = 63/378 - Subtract the two like fractions:
180/378 - 63/378 = 180 - 63/378 = 117/378 - After reducing the fraction, the answer is 13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-9/54 10/21-18/54 10/42-9/54 30/21-9/54 10/21-27/54 10/63-9/54 50/21-9/54 10/21-45/54 70/21-9/54 10/21-63/54