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Add 21/56 and 12/20

21/56 + 12/20 is 39/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 20 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 56 × 5 = 280,
    21/56 = 21 × 5/56 × 5 = 105/280
  3. Likewise, for the 2nd fraction, since 20 × 14 = 280,
    12/20 = 12 × 14/20 × 14 = 168/280
  4. Add the two like fractions:
    105/280 + 168/280 = 105 + 168/280 = 273/280
  5. 273/280 simplified gives 39/40
  6. So, 21/56 + 12/20 = 39/40

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