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Health Occupations Readiness Test Prep

Category - Mathematics

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Which of the following uses the doubling method of informal counting to solve the following:

3 + 4 =

  1. (1 + 1 + 1) + (1 + 1 + 1 + 1) = 7
  2. (3 + 4) + (3 + 4) - (3 + 4) = 7
  3. 3 + 4 = (3 + 3) +1 = 6 + 1 = 7
  4. 2 + 2 + 2 + 1 = 7
Explanation

Answer: C - The doubling method would be 3 + 4 = (3 + 3) +1 = 6 + 1 = 7. Using the doubling method of informal counting involves taking apart a number so that it is the same number as the one being added to it and then adding the difference. It is a way to do mental math easily in one's head.

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