Subtract 3/9 from 18/84
18/84 - 3/9 is -5/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
18/84 = 18 × 3/84 × 3 = 54/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
3/9 = 3 × 28/9 × 28 = 84/252 - Subtract the two like fractions:
54/252 - 84/252 = 54 - 84/252 = -30/252 - After reducing the fraction, the answer is -5/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84-3/9 18/84-6/9 18/84-3/18 54/84-3/9 18/84-3/27 90/84-3/9 18/84-15/9 18/84-3/45 18/84-21/9 18/84-3/63