Subtract 10/15 from 45/21
1st number: 2 3/21, 2nd number: 10/15
45/21 - 10/15 is 31/21.
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,
45/21 = 45 × 5/21 × 5 = 225/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
10/15 = 10 × 7/15 × 7 = 70/105 - Subtract the two like fractions:
225/105 - 70/105 = 225 - 70/105 = 155/105 - After reducing the fraction, the answer is 31/21
- In mixed form: 110/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-10/15 45/21-20/15 45/42-10/15 45/21-10/30 45/21-30/15 45/63-10/15 45/21-10/45 45/21-50/15 45/21-10/75 45/21-70/15