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Add 30/18 and 72/21

1st number: 1 12/18, 2nd number: 3 9/21

30/18 + 72/21 is 107/21.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    30/18 = 30 × 7/18 × 7 = 210/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    72/21 = 72 × 6/21 × 6 = 432/126
  4. Add the two like fractions:
    210/126 + 432/126 = 210 + 432/126 = 642/126
  5. 642/126 simplified gives 107/21
  6. So, 30/18 + 72/21 = 107/21
    In mixed form: 52/21

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