Subtract 20/18 from 3/84
1st number: 3/84, 2nd number: 1 2/18
3/84 - 20/18 is -271/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
3/84 = 3 × 3/84 × 3 = 9/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
20/18 = 20 × 14/18 × 14 = 280/252 - Subtract the two like fractions:
9/252 - 280/252 = 9 - 280/252 = -271/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-20/18 3/84-40/18 3/84-20/36 9/84-20/18 3/84-60/18 3/84-20/54 15/84-20/18 3/84-20/90 21/84-20/18