Subtract 12/35 from 3/42
3/42 - 12/35 is -19/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 35 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
3/42 = 3 × 5/42 × 5 = 15/210 - Likewise, for the 2nd fraction, since 35 × 6 = 210,
12/35 = 12 × 6/35 × 6 = 72/210 - Subtract the two like fractions:
15/210 - 72/210 = 15 - 72/210 = -57/210 - After reducing the fraction, the answer is -19/70
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