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Add 6/21 and 84/90

6/21 + 84/90 is 128/105.

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,
    84/90 = 84 × 7/90 × 7 = 588/630
  4. Add the two fractions:
    180/630 + 588/630 = 180 + 588/630 = 768/630
  5. 768/630 simplified gives 128/105
  6. So, 6/21 + 84/90 = 128/105
    In mixed form: 123/105

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