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Subtract 9/21 from 5/70

5/70 - 9/21 is -5/14.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 21 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 70 × 3 = 210,
    5/70 = 5 × 3/70 × 3 = 15/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    9/21 = 9 × 10/21 × 10 = 90/210
  4. Subtract the two like fractions:
    15/210 - 90/210 = 15 - 90/210 = -75/210
  5. After reducing the fraction, the answer is -5/14

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