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Subtract 21/8 from 21/20

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

21/20 - 21/8 is -63/40.

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,
    21/8 = 21 × 5/8 × 5 = 105/40
  4. Subtract the two fractions:
    42/40 - 105/40 = 42 - 105/40 = -63/40

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