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Subtract 5/20 from 21/18

1st number: 1 3/18, 2nd number: 5/20

21/18 - 5/20 is 11/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 20 is 180
  2. For the 1st fraction, since 18 × 10 = 180,
    21/18 = 21 × 10/18 × 10 = 210/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    5/20 = 5 × 9/20 × 9 = 45/180
  4. Subtract the two fractions:
    210/180 - 45/180 = 210 - 45/180 = 165/180
  5. After reducing the fraction, the answer is 11/12

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