Subtract 21/45 from 18/6
1st number: 3 0/6, 2nd number: 21/45
18/6 - 21/45 is 38/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 6 × 15 = 90,
18/6 = 18 × 15/6 × 15 = 270/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Subtract the two like fractions:
270/90 - 42/90 = 270 - 42/90 = 228/90 - After reducing the fraction, the answer is 38/15
- In mixed form: 28/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/6-21/45 18/6-42/45 18/12-21/45 18/6-21/90 54/6-21/45 18/6-63/45 90/6-21/45 18/30-21/45 18/42-21/45