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Subtract 45/25 from 18/20

1st number: 18/20, 2nd number: 1 20/25

18/20 - 45/25 is -9/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 25 is 100

    Next, find the equivalent fraction of both fractional numbers with denominator 100
  2. For the 1st fraction, since 20 × 5 = 100,
    18/20 = 18 × 5/20 × 5 = 90/100
  3. Likewise, for the 2nd fraction, since 25 × 4 = 100,
    45/25 = 45 × 4/25 × 4 = 180/100
  4. Subtract the two like fractions:
    90/100 - 180/100 = 90 - 180/100 = -90/100
  5. After reducing the fraction, the answer is -9/10

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