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Add 12/21 and 18/90

12/21 + 18/90 is 27/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    12/21 = 12 × 30/21 × 30 = 360/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    18/90 = 18 × 7/90 × 7 = 126/630
  4. Add the two like fractions:
    360/630 + 126/630 = 360 + 126/630 = 486/630
  5. 486/630 simplified gives 27/35
  6. So, 12/21 + 18/90 = 27/35

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