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Add 6/21 and 4/90

6/21 + 4/90 is 104/315.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630
  2. For the 1st fraction, since 21 × 30 = 630,
    6/21 = 6 × 30/21 × 30 = 180/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    4/90 = 4 × 7/90 × 7 = 28/630
  4. Add the two fractions:
    180/630 + 28/630 = 180 + 28/630 = 208/630
  5. After reducing the fraction, the answer is 104/315

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