Subtract 8/42 from 9/21
9/21 - 8/42 is 5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
9/21 = 9 × 2/21 × 2 = 18/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
8/42 = 8 × 1/42 × 1 = 8/42 - Subtract the two like fractions:
18/42 - 8/42 = 18 - 8/42 = 10/42 - After reducing the fraction, the answer is 5/21
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