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Subtract 90/40 from 30/20

1st number: 1 10/20, 2nd number: 2 10/40

30/20 - 90/40 is -3/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 40 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 20 × 2 = 40,
    30/20 = 30 × 2/20 × 2 = 60/40
  3. Likewise, for the 2nd fraction, since 40 × 1 = 40,
    90/40 = 90 × 1/40 × 1 = 90/40
  4. Subtract the two like fractions:
    60/40 - 90/40 = 60 - 90/40 = -30/40
  5. After reducing the fraction, the answer is -3/4

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