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Add 9/21 and 9/10

9/21 + 9/10 is 93/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    9/21 = 9 × 10/21 × 10 = 90/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    9/10 = 9 × 21/10 × 21 = 189/210
  4. Add the two fractions:
    90/210 + 189/210 = 90 + 189/210 = 279/210
  5. After reducing the fraction, the answer is 93/70
  6. In mixed form: 123/70

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