Subtract 4/5 from 7/42
7/42 - 4/5 is -19/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
7/42 = 7 × 5/42 × 5 = 35/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
4/5 = 4 × 42/5 × 42 = 168/210 - Subtract the two like fractions:
35/210 - 168/210 = 35 - 168/210 = -133/210 - After reducing the fraction, the answer is -19/30
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