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Add 3/8 and 9/21

3/8 + 9/21 is 45/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    3/8 = 3 × 21/8 × 21 = 63/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    9/21 = 9 × 8/21 × 8 = 72/168
  4. Add the two like fractions:
    63/168 + 72/168 = 63 + 72/168 = 135/168
  5. 135/168 simplified gives 45/56
  6. So, 3/8 + 9/21 = 45/56

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