[KongchangAI]
Unverified88% confidenceDecision RuleTime unknown

3-4岁初启蒙优先选大颗粒实物操作教具(如10以内计数熊、数棒),颗粒直径≥3cm避免误吞;4-6岁可引入七巧板、逻辑狗类平面推理;6岁以上再考虑百数板、分数积木等抽象概念教具

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88%
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Long-term
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