Subtract 9/15 from 27/42
27/42 - 9/15 is 3/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
27/42 = 27 × 5/42 × 5 = 135/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
9/15 = 9 × 14/15 × 14 = 126/210 - Subtract the two like fractions:
135/210 - 126/210 = 135 - 126/210 = 9/210 - After reducing the fraction, the answer is 3/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-9/15 27/42-18/15 27/84-9/15 27/42-9/30 81/42-9/15 27/42-27/15 27/42-9/45 27/42-45/15 27/42-9/75 27/42-63/15