Subtract 25/70 from 12/42
12/42 - 25/70 is -1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
25/70 = 25 × 3/70 × 3 = 75/210 - Subtract the two like fractions:
60/210 - 75/210 = 60 - 75/210 = -15/210 - After reducing the fraction, the answer is -1/14
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