Subtract 21/15 from 54/21
1st number: 2 12/21, 2nd number: 1 6/15
54/21 - 21/15 is 41/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
54/21 = 54 × 5/21 × 5 = 270/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
21/15 = 21 × 7/15 × 7 = 147/105 - Subtract the two like fractions:
270/105 - 147/105 = 270 - 147/105 = 123/105 - After reducing the fraction, the answer is 41/35
- In mixed form: 16/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-42/15 54/42-21/15 54/21-21/30 54/21-63/15 54/63-21/15 54/21-21/45 54/21-21/75