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Add 21/60 and 4/7

21/60 + 4/7 is 129/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 60 and 7 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 60 × 7 = 420,
    21/60 = 21 × 7/60 × 7 = 147/420
  3. Likewise, for the 2nd fraction, since 7 × 60 = 420,
    4/7 = 4 × 60/7 × 60 = 240/420
  4. Add the two like fractions:
    147/420 + 240/420 = 147 + 240/420 = 387/420
  5. 387/420 simplified gives 129/140
  6. So, 21/60 + 4/7 = 129/140

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