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Add 72/84 and 28/40

72/84 + 28/40 is 109/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    72/84 = 72 × 10/84 × 10 = 720/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    28/40 = 28 × 21/40 × 21 = 588/840
  4. Add the two fractions:
    720/840 + 588/840 = 720 + 588/840 = 1308/840
  5. After reducing the fraction, the answer is 109/70
  6. In mixed form: 139/70

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