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Add 7/84 and 21/90

7/84 + 21/90 is 19/60.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    7/84 = 7 × 15/84 × 15 = 105/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    21/90 = 21 × 14/90 × 14 = 294/1260
  4. Add the two fractions:
    105/1260 + 294/1260 = 105 + 294/1260 = 399/1260
  5. After reducing the fraction, the answer is 19/60

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