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Subtract 21/18 from 1/5

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

1/5 - 21/18 is -29/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 18 is 90
  2. For the 1st fraction, since 5 × 18 = 90,
    1/5 = 1 × 18/5 × 18 = 18/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    21/18 = 21 × 5/18 × 5 = 105/90
  4. Subtract the two fractions:
    18/90 - 105/90 = 18 - 105/90 = -87/90
  5. After reducing the fraction, the answer is -29/30

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