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You did not. Common core teaches some very weird methods of addition and multiplication, and has a "process over product" mentality - getting the wrong answer is fine with the right method, and getting the right answer with the "wrong" method is bad.



Do you have any official sources?

> Interpret a multiplication equation as a comparison, e.g., interpret 35 = 5 × 7 as a statement that 35 is 5 times as many as 7 and 7 times as many as 5. Represent verbal statements of multiplicative comparisons as multiplication equations.

http://www.corestandards.org/Math/Content/4/OA/




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