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Add 20/42 and 21/60

20/42 + 21/60 is 347/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 60 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    20/42 = 20 × 10/42 × 10 = 200/420
  3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
    21/60 = 21 × 7/60 × 7 = 147/420
  4. Add the two fractions:
    200/420 + 147/420 = 200 + 147/420 = 347/420

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