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Add 30/42 and 15/45

30/42 + 15/45 is 22/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 42 × 15 = 630,
    30/42 = 30 × 15/42 × 15 = 450/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    15/45 = 15 × 14/45 × 14 = 210/630
  4. Add the two like fractions:
    450/630 + 210/630 = 450 + 210/630 = 660/630
  5. 660/630 simplified gives 22/21
  6. So, 30/42 + 15/45 = 22/21
    In mixed form: 11/21

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