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Subtract 3/10 from 3/21

3/21 - 3/10 is -11/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    3/21 = 3 × 10/21 × 10 = 30/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    3/10 = 3 × 21/10 × 21 = 63/210
  4. Subtract the two like fractions:
    30/210 - 63/210 = 30 - 63/210 = -33/210
  5. After reducing the fraction, the answer is -11/70

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