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Subtract 18/45 from 20/63

20/63 - 18/45 is -26/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 63 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 63 × 5 = 315,
    20/63 = 20 × 5/63 × 5 = 100/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    18/45 = 18 × 7/45 × 7 = 126/315
  4. Subtract the two like fractions:
    100/315 - 126/315 = 100 - 126/315 = -26/315

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