An Open Number Can Be Used Effectively for Thinking About

question 17

Multiple Choice

An open number can be used effectively for thinking about addition and subtraction.All of the reasons below support the use of an open number line EXCEPT:

• A)Is less flexible than a numbered line.
• B)Eliminates confusion with hash marks and spaces.
• C)Less prone to computational errors.
• D)Helps with modeling student thinking.

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