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Subtract 16/45 from 21/20

1st number: 1 1/20, 2nd number: 16/45

21/20 - 16/45 is 25/36.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 45 is 180
  2. For the 1st fraction, since 20 × 9 = 180,
    21/20 = 21 × 9/20 × 9 = 189/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    16/45 = 16 × 4/45 × 4 = 64/180
  4. Subtract the two fractions:
    189/180 - 64/180 = 189 - 64/180 = 125/180
  5. After reducing the fraction, the answer is 25/36

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