Subtract 3/7 from 81/84
81/84 - 3/7 is 15/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
3/7 = 3 × 12/7 × 12 = 36/84 - Subtract the two like fractions:
81/84 - 36/84 = 81 - 36/84 = 45/84 - After reducing the fraction, the answer is 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84-6/7 81/84-3/14 81/84-9/7 81/84-3/21 81/84-15/7 81/84-3/35 81/84-21/7 81/84-3/49