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Subtract 4/70 from 3/90

3/90 - 4/70 is -1/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    3/90 = 3 × 7/90 × 7 = 21/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    4/70 = 4 × 9/70 × 9 = 36/630
  4. Subtract the two like fractions:
    21/630 - 36/630 = 21 - 36/630 = -15/630
  5. After reducing the fraction, the answer is -1/42

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