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Add 30/40 and 18/84

30/40 + 18/84 is 27/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 84 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    30/40 = 30 × 21/40 × 21 = 630/840
  3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
    18/84 = 18 × 10/84 × 10 = 180/840
  4. Add the two like fractions:
    630/840 + 180/840 = 630 + 180/840 = 810/840
  5. 810/840 simplified gives 27/28
  6. So, 30/40 + 18/84 = 27/28

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