Subtract 84/90 from 15/42
15/42 - 84/90 is -121/210.
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,
15/42 = 15 × 15/42 × 15 = 225/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
84/90 = 84 × 7/90 × 7 = 588/630 - Subtract the two like fractions:
225/630 - 588/630 = 225 - 588/630 = -363/630 - After reducing the fraction, the answer is -121/210
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