Subtract 12/21 from 10/5
1st number: 2 0/5, 2nd number: 12/21
10/5 - 12/21 is 10/7.
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,
10/5 = 10 × 21/5 × 21 = 210/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Subtract the two like fractions:
210/105 - 60/105 = 210 - 60/105 = 150/105 - After reducing the fraction, the answer is 10/7
- In mixed form: 13/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/5-12/21 10/5-24/21 10/5-12/42 30/5-12/21 10/5-36/21 10/15-12/21 10/5-12/63 50/5-12/21 10/5-60/21 10/25-12/21 70/5-12/21 10/5-84/21 10/35-12/21