Subtract 8/21 from 15/5
1st number: 3 0/5, 2nd number: 8/21
15/5 - 8/21 is 55/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
15/5 = 15 × 21/5 × 21 = 315/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
8/21 = 8 × 5/21 × 5 = 40/105 - Subtract the two like fractions:
315/105 - 40/105 = 315 - 40/105 = 275/105 - After reducing the fraction, the answer is 55/21
- In mixed form: 213/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/5-8/21 15/5-16/21 15/10-8/21 15/5-8/42 45/5-8/21 15/5-24/21 15/5-8/63 75/5-8/21 15/5-40/21 15/25-8/21 15/5-56/21 15/35-8/21