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Which of the following uses the doubling method of informal counting to solve the equation "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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