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Subtract 5/18 from 10/21

10/21 - 5/18 is 25/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 21 × 6 = 126,
    10/21 = 10 × 6/21 × 6 = 60/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    5/18 = 5 × 7/18 × 7 = 35/126
  4. Subtract the two like fractions:
    60/126 - 35/126 = 60 - 35/126 = 25/126

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