Subtract 1/84 from 27/28
27/28 - 1/84 is 20/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
27/28 = 27 × 3/28 × 3 = 81/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
1/84 = 1 × 1/84 × 1 = 1/84 - Subtract the two like fractions:
81/84 - 1/84 = 81 - 1/84 = 80/84 - After reducing the fraction, the answer is 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28-1/84 27/28-2/84 27/56-1/84 81/28-1/84 27/28-3/84 27/84-1/84 27/28-5/84 27/28-7/84