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Subtract 21/8 from 7/9

1st number: 7/9, 2nd number: 2 5/8

7/9 - 21/8 is -133/72.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 8 is 72
  2. For the 1st fraction, since 9 × 8 = 72,
    7/9 = 7 × 8/9 × 8 = 56/72
  3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
    21/8 = 21 × 9/8 × 9 = 189/72
  4. Subtract the two fractions:
    56/72 - 189/72 = 56 - 189/72 = -133/72

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