A.
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Give each group consisting of two students, four cards.
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B.
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Have them write the number one on a card, then the number two on another card, then three on the next card, then the number four on the last card.
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C.
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Instruct the student to write as many combinations with the four cards keeping the one in the thousandth place.There are only six different combinations (1234, 1243, 1324, 1342, 1432, and 1423).
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D.
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Allow the students only three minutes to complete the task.
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8.
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Ask the students how many combinations did the end up with?
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9.
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If the child came up with the six correct numbers, they have just completed a formal operational task.
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10.
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If the class could not solve the problem, explain how to systematically came up with it.
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