concluded contracts 

concluded contracts 

ผลลัพธ์ (ไทย) 1:

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ผลลัพธ์ (ไทย) 2:

Error 1(add 3 and 4 first) and Error 4 (y = 12). These two types of errors were similar and most often found because in both situations, students first added “3” and “4.” The difference is that the structure of “3+4y” was misunderstood as “(3+4) y” in Error 1, while as “3+4+y” in Error 4. These students followed algorithms about solving linear equations very well in the remaining steps (see Figure 4.10 for typical students’ response). That is, except for the first step of misunderstanding “3+4y” as “(3+4)y” or “3+4+y”, the remaining steps of solving the equation were completely correct.

ผลลัพธ์ (ไทย) 3:

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