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Subtract 2/45 from 1/21

1/21 - 2/45 is 1/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 21 × 15 = 315,
    1/21 = 1 × 15/21 × 15 = 15/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    2/45 = 2 × 7/45 × 7 = 14/315
  4. Subtract the two like fractions:
    15/315 - 14/315 = 15 - 14/315 = 1/315

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