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Add 18/28 and 21/60

18/28 + 21/60 is 139/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 60 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 28 × 15 = 420,
    18/28 = 18 × 15/28 × 15 = 270/420
  3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
    21/60 = 21 × 7/60 × 7 = 147/420
  4. Add the two like fractions:
    270/420 + 147/420 = 270 + 147/420 = 417/420
  5. 417/420 simplified gives 139/140
  6. So, 18/28 + 21/60 = 139/140

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