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Add 15/40 and 54/84

15/40 + 54/84 is 57/56.

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,
    15/40 = 15 × 21/40 × 21 = 315/840
  3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
    54/84 = 54 × 10/84 × 10 = 540/840
  4. Add the two like fractions:
    315/840 + 540/840 = 315 + 540/840 = 855/840
  5. 855/840 simplified gives 57/56
  6. So, 15/40 + 54/84 = 57/56
    In mixed form: 11/56

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