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Add 5/21 and 12/90

5/21 + 12/90 is 13/35.

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,
    5/21 = 5 × 30/21 × 30 = 150/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    12/90 = 12 × 7/90 × 7 = 84/630
  4. Add the two like fractions:
    150/630 + 84/630 = 150 + 84/630 = 234/630
  5. 234/630 simplified gives 13/35
  6. So, 5/21 + 12/90 = 13/35

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