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Subtract 1/21 from 7/45

7/45 - 1/21 is 34/315.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 45 × 7 = 315,
    7/45 = 7 × 7/45 × 7 = 49/315
  3. Likewise, for the 2nd fraction, since 21 × 15 = 315,
    1/21 = 1 × 15/21 × 15 = 15/315
  4. Subtract the two like fractions:
    49/315 - 15/315 = 49 - 15/315 = 34/315

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