Subtract 20/30 from 7/27
7/27 - 20/30 is -11/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 30 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
7/27 = 7 × 10/27 × 10 = 70/270 - Likewise, for the 2nd fraction, since 30 × 9 = 270,
20/30 = 20 × 9/30 × 9 = 180/270 - Subtract the two like fractions:
70/270 - 180/270 = 70 - 180/270 = -110/270 - After reducing the fraction, the answer is -11/27
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