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Subtract 3/20 from 90/45

1st number: 2 0/45, 2nd number: 3/20

90/45 - 3/20 is 37/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 20 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 45 × 4 = 180,
    90/45 = 90 × 4/45 × 4 = 360/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    3/20 = 3 × 9/20 × 9 = 27/180
  4. Subtract the two like fractions:
    360/180 - 27/180 = 360 - 27/180 = 333/180
  5. After reducing the fraction, the answer is 37/20
  6. In mixed form: 117/20

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