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Subtract 21/9 from 15/30

1st number: 15/30, 2nd number: 2 3/9

15/30 - 21/9 is -11/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 9 is 90
  2. For the 1st fraction, since 30 × 3 = 90,
    15/30 = 15 × 3/30 × 3 = 45/90
  3. Likewise, for the 2nd fraction, since 9 × 10 = 90,
    21/9 = 21 × 10/9 × 10 = 210/90
  4. Subtract the two fractions:
    45/90 - 210/90 = 45 - 210/90 = -165/90
  5. After reducing the fraction, the answer is -11/6

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