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Subtract 64/90 from 21/50

21/50 - 64/90 is -131/450.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 50 and 90 is 450
  2. For the 1st fraction, since 50 × 9 = 450,
    21/50 = 21 × 9/50 × 9 = 189/450
  3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
    64/90 = 64 × 5/90 × 5 = 320/450
  4. Subtract the two fractions:
    189/450 - 320/450 = 189 - 320/450 = -131/450

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