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Subtract 12/45 from 30/21

1st number: 1 9/21, 2nd number: 12/45

30/21 - 12/45 is 122/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 21 × 15 = 315,
    30/21 = 30 × 15/21 × 15 = 450/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    12/45 = 12 × 7/45 × 7 = 84/315
  4. Subtract the two like fractions:
    450/315 - 84/315 = 450 - 84/315 = 366/315
  5. After reducing the fraction, the answer is 122/105
  6. In mixed form: 117/105

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