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Subtract 20/70 from 8/90

8/90 - 20/70 is -62/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    8/90 = 8 × 7/90 × 7 = 56/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    20/70 = 20 × 9/70 × 9 = 180/630
  4. Subtract the two fractions:
    56/630 - 180/630 = 56 - 180/630 = -124/630
  5. After reducing the fraction, the answer is -62/315

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