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Subtract 10/21 from 18/70

18/70 - 10/21 is -23/105.

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,
    18/70 = 18 × 3/70 × 3 = 54/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    10/21 = 10 × 10/21 × 10 = 100/210
  4. Subtract the two like fractions:
    54/210 - 100/210 = 54 - 100/210 = -46/210
  5. After reducing the fraction, the answer is -23/105

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