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Subtract 4/40 from 20/42

20/42 - 4/40 is 79/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    20/42 = 20 × 20/42 × 20 = 400/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    4/40 = 4 × 21/40 × 21 = 84/840
  4. Subtract the two fractions:
    400/840 - 84/840 = 400 - 84/840 = 316/840
  5. After reducing the fraction, the answer is 79/210

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