Subtract 27/40 from 18/84
18/84 - 27/40 is -129/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
18/84 = 18 × 10/84 × 10 = 180/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
27/40 = 27 × 21/40 × 21 = 567/840 - Subtract the two like fractions:
180/840 - 567/840 = 180 - 567/840 = -387/840 - After reducing the fraction, the answer is -129/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84-27/40 18/84-54/40 18/84-27/80 54/84-27/40 18/84-81/40 90/84-27/40