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Subtract 3/8 from 9/21

9/21 - 3/8 is 3/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    9/21 = 9 × 8/21 × 8 = 72/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    3/8 = 3 × 21/8 × 21 = 63/168
  4. Subtract the two fractions:
    72/168 - 63/168 = 72 - 63/168 = 9/168
  5. After reducing the fraction, the answer is 3/56

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