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Add 3/21 and 9/8

1st number: 3/21, 2nd number: 1 1/8

3/21 + 9/8 is 71/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    3/21 = 3 × 8/21 × 8 = 24/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  4. Add the two fractions:
    24/168 + 189/168 = 24 + 189/168 = 213/168
  5. 213/168 simplified gives 71/56
  6. So, 3/21 + 9/8 = 71/56
    In mixed form: 115/56

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