Subtract 72/7 from 27/40
1st number: 27/40, 2nd number: 10 2/7
27/40 - 72/7 is -2691/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
27/40 = 27 × 7/40 × 7 = 189/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
72/7 = 72 × 40/7 × 40 = 2880/280 - Subtract the two like fractions:
189/280 - 2880/280 = 189 - 2880/280 = -2691/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/40-72/7 27/80-72/7 27/40-72/14 81/40-72/7 27/40-72/21 27/40-72/35 27/40-72/49