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Subtract 7/45 from 18/21

18/21 - 7/45 is 221/315.

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,
    18/21 = 18 × 15/21 × 15 = 270/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    7/45 = 7 × 7/45 × 7 = 49/315
  4. Subtract the two fractions:
    270/315 - 49/315 = 270 - 49/315 = 221/315

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