Subtract 27/30 from 28/56
28/56 - 27/30 is -2/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
28/56 = 28 × 15/56 × 15 = 420/840 - Likewise, for the 2nd fraction, since 30 × 28 = 840,
27/30 = 27 × 28/30 × 28 = 756/840 - Subtract the two like fractions:
420/840 - 756/840 = 420 - 756/840 = -336/840 - After reducing the fraction, the answer is -2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/56-54/30 28/56-27/60 84/56-27/30 28/56-81/30 28/56-27/90