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Add 10/21 and 7/9

10/21 + 7/9 is 79/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    10/21 = 10 × 3/21 × 3 = 30/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    7/9 = 7 × 7/9 × 7 = 49/63
  4. Add the two fractions:
    30/63 + 49/63 = 30 + 49/63 = 79/63
  5. So, 10/21 + 7/9 = 79/63
    In mixed form: 116/63

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