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Subtract 9/21 from 27/20

1st number: 1 7/20, 2nd number: 9/21

27/20 - 9/21 is 129/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    27/20 = 27 × 21/20 × 21 = 567/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    9/21 = 9 × 20/21 × 20 = 180/420
  4. Subtract the two fractions:
    567/420 - 180/420 = 567 - 180/420 = 387/420
  5. After reducing the fraction, the answer is 129/140

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