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Add 7/8 and 3/21

7/8 + 3/21 is 57/56.

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,
    7/8 = 7 × 21/8 × 21 = 147/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    3/21 = 3 × 8/21 × 8 = 24/168
  4. Add the two like fractions:
    147/168 + 24/168 = 147 + 24/168 = 171/168
  5. 171/168 simplified gives 57/56
  6. So, 7/8 + 3/21 = 57/56
    In mixed form: 11/56

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