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Subtract 20/21 from 42/5

1st number: 8 2/5, 2nd number: 20/21

42/5 - 20/21 is 782/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    42/5 = 42 × 21/5 × 21 = 882/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    20/21 = 20 × 5/21 × 5 = 100/105
  4. Subtract the two like fractions:
    882/105 - 100/105 = 882 - 100/105 = 782/105
  5. In mixed form: 747/105

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