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Subtract 45/10 from 21/8

1st number: 2 5/8, 2nd number: 4 5/10

21/8 - 45/10 is -15/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 10 is 40
  2. For the 1st fraction, since 8 × 5 = 40,
    21/8 = 21 × 5/8 × 5 = 105/40
  3. Likewise, for the 2nd fraction, since 10 × 4 = 40,
    45/10 = 45 × 4/10 × 4 = 180/40
  4. Subtract the two fractions:
    105/40 - 180/40 = 105 - 180/40 = -75/40
  5. After reducing the fraction, the answer is -15/8

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