Peyton is 11 years old and knows 10-7=3 and 3+7=10 but finds it difficult to solve a math problem, such as 3x-5, because she cannot understand why there is a letter in the problem. Piaget would most likely place her in the

concrete operational stage

Step-by-step explanation:

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The concrete operational stage is the third phase in Piaget's cognitive development theory. This period spans the period between childhood, it begins around 7 years of age and continues until about 11 years of age and is characterized by the development of logical thinking.

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step-by-step explanation:

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