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Subtract 4/18 from 5/21

5/21 - 4/18 is 1/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126
  2. For the 1st fraction, since 21 × 6 = 126,
    5/21 = 5 × 6/21 × 6 = 30/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    4/18 = 4 × 7/18 × 7 = 28/126
  4. Subtract the two fractions:
    30/126 - 28/126 = 30 - 28/126 = 2/126
  5. After reducing the fraction, the answer is 1/63

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