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Add 12/90 and 27/42

12/90 + 27/42 is 163/210.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    12/90 = 12 × 7/90 × 7 = 84/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    27/42 = 27 × 15/42 × 15 = 405/630
  4. Add the two like fractions:
    84/630 + 405/630 = 84 + 405/630 = 489/630
  5. 489/630 simplified gives 163/210
  6. So, 12/90 + 27/42 = 163/210

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