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Subtract 3/8 from 21/20

1st number: 1 1/20, 2nd number: 3/8

21/20 - 3/8 is 27/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 8 is 40
  2. For the 1st fraction, since 20 × 2 = 40,
    21/20 = 21 × 2/20 × 2 = 42/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    3/8 = 3 × 5/8 × 5 = 15/40
  4. Subtract the two fractions:
    42/40 - 15/40 = 42 - 15/40 = 27/40

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