Subtract 84/42 from 6/21
1st number: 6/21, 2nd number: 2 0/42
6/21 - 84/42 is -12/7.
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,
6/21 = 6 × 2/21 × 2 = 12/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
84/42 = 84 × 1/42 × 1 = 84/42 - Subtract the two like fractions:
12/42 - 84/42 = 12 - 84/42 = -72/42 - After reducing the fraction, the answer is -12/7
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