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The child's subtraction process appears to show a misunderstanding of the standard subtraction algorithm, particularly with regard to borrowing or regrouping. Let's analyze the problem step by step and then discuss how to help the child correct her mistake. ### Analysis of the Child's Work: The subtraction problem is: ``` 45 - 28 ----- ``` The child's answer is: ``` 45 - 28 ----- 23 ``` The correct answer should be: ``` 45 - 28 ----- 17 ``` ### Possible Logic Behind the Child's Mistake: 1. No Borrowing/Regrouping: The child likely subtracted the digits in each column without borrowing or regrouping. For example: - In the ________ _______ _________ ____ _______ ________ ______.
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