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Subtract 3/42 from 30/40

30/40 - 3/42 is 19/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 42 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    30/40 = 30 × 21/40 × 21 = 630/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    3/42 = 3 × 20/42 × 20 = 60/840
  4. Subtract the two fractions:
    630/840 - 60/840 = 630 - 60/840 = 570/840
  5. After reducing the fraction, the answer is 19/28

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