Subtract 9/27 from 20/42
20/42 - 9/27 is 1/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
20/42 = 20 × 9/42 × 9 = 180/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
9/27 = 9 × 14/27 × 14 = 126/378 - Subtract the two like fractions:
180/378 - 126/378 = 180 - 126/378 = 54/378 - After reducing the fraction, the answer is 1/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-9/27 20/42-18/27 20/84-9/27 20/42-9/54 60/42-9/27 20/42-9/81 20/42-45/27 20/42-63/27