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Add 28/40 and 18/42

28/40 + 18/42 is 79/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 42 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    28/40 = 28 × 21/40 × 21 = 588/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    18/42 = 18 × 20/42 × 20 = 360/840
  4. Add the two like fractions:
    588/840 + 360/840 = 588 + 360/840 = 948/840
  5. 948/840 simplified gives 79/70
  6. So, 28/40 + 18/42 = 79/70
    In mixed form: 19/70

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