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Subtract 21/40 from 21/4

1st number: 5 1/4, 2nd number: 21/40

21/4 - 21/40 is 189/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 40 is 40
  2. For the 1st fraction, since 4 × 10 = 40,
    21/4 = 21 × 10/4 × 10 = 210/40
  3. Likewise, for the 2nd fraction, since 40 × 1 = 40,
    21/40 = 21 × 1/40 × 1 = 21/40
  4. Subtract the two fractions:
    210/40 - 21/40 = 210 - 21/40 = 189/40
  5. In mixed form: 429/40

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