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Subtract 70/90 from 30/70

30/70 - 70/90 is -22/63.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    30/70 = 30 × 9/70 × 9 = 270/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    70/90 = 70 × 7/90 × 7 = 490/630
  4. Subtract the two like fractions:
    270/630 - 490/630 = 270 - 490/630 = -220/630
  5. After reducing the fraction, the answer is -22/63

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