Subtract 6/45 from 81/20
1st number: 4 1/20, 2nd number: 6/45
81/20 - 6/45 is 47/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
81/20 = 81 × 9/20 × 9 = 729/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
6/45 = 6 × 4/45 × 4 = 24/180 - Subtract the two like fractions:
729/180 - 24/180 = 729 - 24/180 = 705/180 - After reducing the fraction, the answer is 47/12
- In mixed form: 311/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-12/45 81/40-6/45 81/20-6/90 81/20-18/45 81/60-6/45 81/20-30/45 81/20-42/45