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Subtract 4/45 from 15/21

15/21 - 4/45 is 197/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    15/21 = 15 × 15/21 × 15 = 225/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    4/45 = 4 × 7/45 × 7 = 28/315
  4. Subtract the two fractions:
    225/315 - 28/315 = 225 - 28/315 = 197/315

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