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Subtract 6/18 from 30/21

1st number: 1 9/21, 2nd number: 6/18

30/21 - 6/18 is 23/21.

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,
    30/21 = 30 × 6/21 × 6 = 180/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    6/18 = 6 × 7/18 × 7 = 42/126
  4. Subtract the two like fractions:
    180/126 - 42/126 = 180 - 42/126 = 138/126
  5. After reducing the fraction, the answer is 23/21
  6. In mixed form: 12/21

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