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Subtract 4/45 from 20/21

20/21 - 4/45 is 272/315.

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,
    20/21 = 20 × 15/21 × 15 = 300/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    4/45 = 4 × 7/45 × 7 = 28/315
  4. Subtract the two fractions:
    300/315 - 28/315 = 300 - 28/315 = 272/315

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