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Add 81/42 and 70/40

1st number: 1 39/42, 2nd number: 1 30/40

81/42 + 70/40 is 103/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    81/42 = 81 × 20/42 × 20 = 1620/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    70/40 = 70 × 21/40 × 21 = 1470/840
  4. Add the two fractions:
    1620/840 + 1470/840 = 1620 + 1470/840 = 3090/840
  5. After reducing the fraction, the answer is 103/28
  6. In mixed form: 319/28

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