Subtract 18/12 from 25/42
1st number: 25/42, 2nd number: 1 6/12
25/42 - 18/12 is -19/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
25/42 = 25 × 2/42 × 2 = 50/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
18/12 = 18 × 7/12 × 7 = 126/84 - Subtract the two like fractions:
50/84 - 126/84 = 50 - 126/84 = -76/84 - After reducing the fraction, the answer is -19/21
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