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Add 20/21 and 28/56

20/21 + 28/56 is 61/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 56 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    20/21 = 20 × 8/21 × 8 = 160/168
  3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
    28/56 = 28 × 3/56 × 3 = 84/168
  4. Add the two fractions:
    160/168 + 84/168 = 160 + 84/168 = 244/168
  5. 244/168 simplified gives 61/42
  6. So, 20/21 + 28/56 = 61/42
    In mixed form: 119/42

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