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Add 12/20 and 25/42

12/20 + 25/42 is 251/210.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 42 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    12/20 = 12 × 21/20 × 21 = 252/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    25/42 = 25 × 10/42 × 10 = 250/420
  4. Add the two like fractions:
    252/420 + 250/420 = 252 + 250/420 = 502/420
  5. 502/420 simplified gives 251/210
  6. So, 12/20 + 25/42 = 251/210
    In mixed form: 141/210

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