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Subtract 21/81 from 42/10

1st number: 4 2/10, 2nd number: 21/81

42/10 - 21/81 is 532/135.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 81 is 810
  2. For the 1st fraction, since 10 × 81 = 810,
    42/10 = 42 × 81/10 × 81 = 3402/810
  3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
    21/81 = 21 × 10/81 × 10 = 210/810
  4. Subtract the two fractions:
    3402/810 - 210/810 = 3402 - 210/810 = 3192/810
  5. After reducing the fraction, the answer is 532/135
  6. In mixed form: 3127/135

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