Subtract 42/5 from 20/42
1st number: 20/42, 2nd number: 8 2/5
20/42 - 42/5 is -832/105.
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,
20/42 = 20 × 5/42 × 5 = 100/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
42/5 = 42 × 42/5 × 42 = 1764/210 - Subtract the two like fractions:
100/210 - 1764/210 = 100 - 1764/210 = -1664/210 - After reducing the fraction, the answer is -832/105
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