Subtract 18/28 from 20/42
20/42 - 18/28 is -1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
20/42 = 20 × 2/42 × 2 = 40/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
18/28 = 18 × 3/28 × 3 = 54/84 - Subtract the two like fractions:
40/84 - 54/84 = 40 - 54/84 = -14/84 - After reducing the fraction, the answer is -1/6
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