Subtract 9/40 from 27/42
27/42 - 9/40 is 117/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
27/42 = 27 × 20/42 × 20 = 540/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Subtract the two like fractions:
540/840 - 189/840 = 540 - 189/840 = 351/840 - After reducing the fraction, the answer is 117/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-9/40 27/42-18/40 27/84-9/40 27/42-9/80 81/42-9/40 27/42-27/40 27/42-45/40 27/42-63/40