Subtract 18/35 from 81/84
81/84 - 18/35 is 9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 35 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Likewise, for the 2nd fraction, since 35 × 12 = 420,
18/35 = 18 × 12/35 × 12 = 216/420 - Subtract the two like fractions:
405/420 - 216/420 = 405 - 216/420 = 189/420 - After reducing the fraction, the answer is 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84-36/35 81/84-18/70 81/84-54/35 81/84-90/35