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Subtract 1/20 from 63/42

1st number: 1 21/42, 2nd number: 1/20

63/42 - 1/20 is 29/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    63/42 = 63 × 10/42 × 10 = 630/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    1/20 = 1 × 21/20 × 21 = 21/420
  4. Subtract the two fractions:
    630/420 - 21/420 = 630 - 21/420 = 609/420
  5. After reducing the fraction, the answer is 29/20
  6. In mixed form: 19/20

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