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Subtract 1/63 from 20/45

20/45 - 1/63 is 3/7.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 45 × 7 = 315,
    20/45 = 20 × 7/45 × 7 = 140/315
  3. Likewise, for the 2nd fraction, since 63 × 5 = 315,
    1/63 = 1 × 5/63 × 5 = 5/315
  4. Subtract the two like fractions:
    140/315 - 5/315 = 140 - 5/315 = 135/315
  5. After reducing the fraction, the answer is 3/7

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