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Subtract 45/10 from 21/28

1st number: 21/28, 2nd number: 4 5/10

21/28 - 45/10 is -15/4.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 10 is 140
  2. For the 1st fraction, since 28 × 5 = 140,
    21/28 = 21 × 5/28 × 5 = 105/140
  3. Likewise, for the 2nd fraction, since 10 × 14 = 140,
    45/10 = 45 × 14/10 × 14 = 630/140
  4. Subtract the two fractions:
    105/140 - 630/140 = 105 - 630/140 = -525/140
  5. After reducing the fraction, the answer is -15/4

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