Subtract 30/81 from 45/20
1st number: 2 5/20, 2nd number: 30/81
45/20 - 30/81 is 203/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
45/20 = 45 × 81/20 × 81 = 3645/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
30/81 = 30 × 20/81 × 20 = 600/1620 - Subtract the two like fractions:
3645/1620 - 600/1620 = 3645 - 600/1620 = 3045/1620 - After reducing the fraction, the answer is 203/108
- In mixed form: 195/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20-30/81 45/20-60/81 45/40-30/81 45/20-90/81 45/60-30/81