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Subtract 1/10 from 2/21

2/21 - 1/10 is -1/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    2/21 = 2 × 10/21 × 10 = 20/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    1/10 = 1 × 21/10 × 21 = 21/210
  4. Subtract the two fractions:
    20/210 - 21/210 = 20 - 21/210 = -1/210

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