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Add 24/42 and 21/60

24/42 + 21/60 is 129/140.

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,
    24/42 = 24 × 10/42 × 10 = 240/420
  3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
    21/60 = 21 × 7/60 × 7 = 147/420
  4. Add the two fractions:
    240/420 + 147/420 = 240 + 147/420 = 387/420
  5. 387/420 simplified gives 129/140
  6. So, 24/42 + 21/60 = 129/140

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