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Subtract 3/45 from 20/42

20/42 - 3/45 is 43/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    20/42 = 20 × 15/42 × 15 = 300/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    3/45 = 3 × 14/45 × 14 = 42/630
  4. Subtract the two fractions:
    300/630 - 42/630 = 300 - 42/630 = 258/630
  5. After reducing the fraction, the answer is 43/105

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