Subtract 20/81 from 9/5
1st number: 1 4/5, 2nd number: 20/81
9/5 - 20/81 is 629/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
9/5 = 9 × 81/5 × 81 = 729/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Subtract the two like fractions:
729/405 - 100/405 = 729 - 100/405 = 629/405 - In mixed form: 1224/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/5-20/81 9/5-40/81 9/10-20/81 27/5-20/81 9/5-60/81 9/15-20/81 45/5-20/81 9/25-20/81 63/5-20/81 9/35-20/81