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Subtract 90/50 from 20/45

1st number: 20/45, 2nd number: 1 40/50

20/45 - 90/50 is -61/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 50 is 450
  2. For the 1st fraction, since 45 × 10 = 450,
    20/45 = 20 × 10/45 × 10 = 200/450
  3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
    90/50 = 90 × 9/50 × 9 = 810/450
  4. Subtract the two fractions:
    200/450 - 810/450 = 200 - 810/450 = -610/450
  5. After reducing the fraction, the answer is -61/45

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