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Subtract 3/40 from 45/21

1st number: 2 3/21, 2nd number: 3/40

45/21 - 3/40 is 579/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    45/21 = 45 × 40/21 × 40 = 1800/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    3/40 = 3 × 21/40 × 21 = 63/840
  4. Subtract the two fractions:
    1800/840 - 63/840 = 1800 - 63/840 = 1737/840
  5. After reducing the fraction, the answer is 579/280
  6. In mixed form: 219/280

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