Subtract 9/40 from 27/28
27/28 - 9/40 is 207/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
27/28 = 27 × 10/28 × 10 = 270/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
9/40 = 9 × 7/40 × 7 = 63/280 - Subtract the two like fractions:
270/280 - 63/280 = 270 - 63/280 = 207/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28-9/40 27/28-18/40 27/56-9/40 27/28-9/80 81/28-9/40 27/28-27/40 27/84-9/40 27/28-45/40 27/28-63/40