Subtract 27/90 from 12/42
12/42 - 27/90 is -1/70.
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,
12/42 = 12 × 15/42 × 15 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
27/90 = 27 × 7/90 × 7 = 189/630 - Subtract the two like fractions:
180/630 - 189/630 = 180 - 189/630 = -9/630 - After reducing the fraction, the answer is -1/70
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