Subtract 36/42 from 81/40
1st number: 2 1/40, 2nd number: 36/42
81/40 - 36/42 is 327/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
81/40 = 81 × 21/40 × 21 = 1701/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
36/42 = 36 × 20/42 × 20 = 720/840 - Subtract the two like fractions:
1701/840 - 720/840 = 1701 - 720/840 = 981/840 - After reducing the fraction, the answer is 327/280
- In mixed form: 147/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-72/42 81/80-36/42 81/40-36/84