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Subtract 3/90 from 1/70

1/70 - 3/90 is -2/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 90 is 630
  2. For the 1st fraction, since 70 × 9 = 630,
    1/70 = 1 × 9/70 × 9 = 9/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    3/90 = 3 × 7/90 × 7 = 21/630
  4. Subtract the two fractions:
    9/630 - 21/630 = 9 - 21/630 = -12/630
  5. After reducing the fraction, the answer is -2/105

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