Subtract 10/21 from 54/15
1st number: 3 9/15, 2nd number: 10/21
54/15 - 10/21 is 328/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
54/15 = 54 × 7/15 × 7 = 378/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
10/21 = 10 × 5/21 × 5 = 50/105 - Subtract the two like fractions:
378/105 - 50/105 = 378 - 50/105 = 328/105 - In mixed form: 313/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15-20/21 54/30-10/21 54/15-10/42 54/15-30/21 54/45-10/21 54/15-10/63 54/15-50/21 54/75-10/21 54/15-70/21