策略性选择表征方式

能根据问题需求，策略性地选择和使用工具与表征方式：在心算、正式书面计算、量角器、分数条和图形之间做出恰当选择。

Select and use tools and representations strategically: choose between mental methods, formal written methods, protractors, fraction strips, and diagrams based on the demands of the problem

学习证据 / Evidence

• 计算25 × 40时选择心算，而计算347 × 26时选择列竖式乘法。
• 选择用量角器来验证估算出的角度，而不是仅靠目测。
• 在对分数进行排序时，能在通分法和基准比较法之间做出选择，并解释原因。

• Choose mental multiplication for 25 × 40 but long multiplication for 347 × 26
• Select a protractor to verify an estimated angle rather than relying on visual inspection alone
• Choose a common-denominator approach vs. benchmark comparison for ordering fractions, and explain why

评估问题 / Assessment

当{{name}}遇到几何或比例问题时，他/她是否会选择合适的工具——比如用量角器测量角度、用分数条比较分数——而不是总默认用一种方法？

When {{name}} faces a geometry or proportion problem, do they choose the right tool — like a protractor for angles or a fraction strip for comparing fractions — rather than always defaulting to one method?