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Subtract 21/90 from 45/80

45/80 - 21/90 is 79/240.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 90 is 720
  2. For the 1st fraction, since 80 × 9 = 720,
    45/80 = 45 × 9/80 × 9 = 405/720
  3. Likewise, for the 2nd fraction, since 90 × 8 = 720,
    21/90 = 21 × 8/90 × 8 = 168/720
  4. Subtract the two fractions:
    405/720 - 168/720 = 405 - 168/720 = 237/720
  5. After reducing the fraction, the answer is 79/240

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