Subtract 42/90 from 1/42
1/42 - 42/90 is -31/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
1/42 = 1 × 15/42 × 15 = 15/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
15/630 - 294/630 = 15 - 294/630 = -279/630 - After reducing the fraction, the answer is -31/70
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