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Subtract 5/70 from 20/21

20/21 - 5/70 is 37/42.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    20/21 = 20 × 10/21 × 10 = 200/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    5/70 = 5 × 3/70 × 3 = 15/210
  4. Subtract the two like fractions:
    200/210 - 15/210 = 200 - 15/210 = 185/210
  5. After reducing the fraction, the answer is 37/42

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