Subtract 27/35 from 20/42
20/42 - 27/35 is -31/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
27/35 = 27 × 6/35 × 6 = 162/210 - Subtract the two like fractions:
100/210 - 162/210 = 100 - 162/210 = -62/210 - After reducing the fraction, the answer is -31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-27/35 20/42-54/35 20/84-27/35 20/42-27/70 60/42-27/35 20/42-81/35