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Subtract 21/40 from 45/7

1st number: 6 3/7, 2nd number: 21/40

45/7 - 21/40 is 1653/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 40 is 280
  2. For the 1st fraction, since 7 × 40 = 280,
    45/7 = 45 × 40/7 × 40 = 1800/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    21/40 = 21 × 7/40 × 7 = 147/280
  4. Subtract the two fractions:
    1800/280 - 147/280 = 1800 - 147/280 = 1653/280
  5. In mixed form: 5253/280

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