Subtract 42/84 from 35/75
35/75 - 42/84 is -1/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 84 is 2100
Next, find the equivalent fraction of both fractional numbers with denominator 2100 - For the 1st fraction, since 75 × 28 = 2100,
35/75 = 35 × 28/75 × 28 = 980/2100 - Likewise, for the 2nd fraction, since 84 × 25 = 2100,
42/84 = 42 × 25/84 × 25 = 1050/2100 - Subtract the two like fractions:
980/2100 - 1050/2100 = 980 - 1050/2100 = -70/2100 - After reducing the fraction, the answer is -1/30
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Related: 70/75-42/84