Subtract 18/21 from 49/84
49/84 - 18/21 is -23/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
49/84 = 49 × 1/84 × 1 = 49/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Subtract the two like fractions:
49/84 - 72/84 = 49 - 72/84 = -23/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/84-18/21 49/84-36/21 49/84-18/42 49/84-54/21 49/84-18/63 49/84-90/21