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Subtract 45/10 from 21/20

1st number: 1 1/20, 2nd number: 4 5/10

21/20 - 45/10 is -69/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 10 is 20
  2. For the 1st fraction, since 20 × 1 = 20,
    21/20 = 21 × 1/20 × 1 = 21/20
  3. Likewise, for the 2nd fraction, since 10 × 2 = 20,
    45/10 = 45 × 2/10 × 2 = 90/20
  4. Subtract the two fractions:
    21/20 - 90/20 = 21 - 90/20 = -69/20

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