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Subtract 20/5 from 18/72

1st number: 18/72, 2nd number: 4 0/5

18/72 - 20/5 is -15/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 5 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    18/72 = 18 × 5/72 × 5 = 90/360
  3. Likewise, for the 2nd fraction, since 5 × 72 = 360,
    20/5 = 20 × 72/5 × 72 = 1440/360
  4. Subtract the two like fractions:
    90/360 - 1440/360 = 90 - 1440/360 = -1350/360
  5. After reducing the fraction, the answer is -15/4

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