Subtract 40/30 from 27/42
1st number: 27/42, 2nd number: 1 10/30
27/42 - 40/30 is -29/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 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 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Subtract the two like fractions:
135/210 - 280/210 = 135 - 280/210 = -145/210 - After reducing the fraction, the answer is -29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-40/30 27/42-80/30 27/84-40/30 27/42-40/60 81/42-40/30 27/42-40/90