Subtract 7/81 from 40/60
40/60 - 7/81 is 47/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 60 × 27 = 1620,
40/60 = 40 × 27/60 × 27 = 1080/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
7/81 = 7 × 20/81 × 20 = 140/1620 - Subtract the two like fractions:
1080/1620 - 140/1620 = 1080 - 140/1620 = 940/1620 - After reducing the fraction, the answer is 47/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/60-7/81 40/60-14/81 40/60-21/81 40/60-35/81 40/60-49/81