Subtract 9/21 from 8/90
8/90 - 9/21 is -107/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
8/90 = 8 × 7/90 × 7 = 56/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
9/21 = 9 × 30/21 × 30 = 270/630 - Subtract the two like fractions:
56/630 - 270/630 = 56 - 270/630 = -214/630 - After reducing the fraction, the answer is -107/315
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