Subtract 15/45 from 21/2
1st number: 10 1/2, 2nd number: 15/45
21/2 - 15/45 is 61/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 2 × 45 = 90,
21/2 = 21 × 45/2 × 45 = 945/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
15/45 = 15 × 2/45 × 2 = 30/90 - Subtract the two like fractions:
945/90 - 30/90 = 945 - 30/90 = 915/90 - After reducing the fraction, the answer is 61/6
- In mixed form: 101/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-15/45 21/2-30/45 21/4-15/45 21/2-15/90 63/2-15/45 21/6-15/45 21/2-75/45 21/10-15/45 21/14-15/45