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Subtract 9/40 from 90/84

1st number: 1 6/84, 2nd number: 9/40

90/84 - 9/40 is 237/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    90/84 = 90 × 10/84 × 10 = 900/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  4. Subtract the two fractions:
    900/840 - 189/840 = 900 - 189/840 = 711/840
  5. After reducing the fraction, the answer is 237/280

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