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Subtract 21/16 from 7/9

1st number: 7/9, 2nd number: 1 5/16

7/9 - 21/16 is -77/144.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 16 is 144
  2. For the 1st fraction, since 9 × 16 = 144,
    7/9 = 7 × 16/9 × 16 = 112/144
  3. Likewise, for the 2nd fraction, since 16 × 9 = 144,
    21/16 = 21 × 9/16 × 9 = 189/144
  4. Subtract the two fractions:
    112/144 - 189/144 = 112 - 189/144 = -77/144

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