Subtract 21/7 from 27/54
1st number: 27/54, 2nd number: 3 0/7
27/54 - 21/7 is -5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 7 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
27/54 = 27 × 7/54 × 7 = 189/378 - Likewise, for the 2nd fraction, since 7 × 54 = 378,
21/7 = 21 × 54/7 × 54 = 1134/378 - Subtract the two like fractions:
189/378 - 1134/378 = 189 - 1134/378 = -945/378 - After reducing the fraction, the answer is -5/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 27/54-42/7 27/54-21/14 81/54-21/7 27/54-63/7 27/54-21/35 27/54-21/49