选择数学工具

策略性地选择和使用适当的工具与表征方式：在口算、书面和图示方法之间做出选择；使用计算器进行验算；选择适合任务的分数模型。

Select and use appropriate tools and representations strategically: choose between mental, written, and diagrammatic methods; use calculators for checking; select fraction models suited to the task

学习证据 / Evidence

• 决定对25×4采用心算，而对167×3采用笔算
• 选择用分数条而不是数轴来比较3/8和1/4
• 用尺子和方格纸，在计算出长×宽后，通过数方格来验证面积

• Decide to use mental multiplication for 25×4 but a written method for 167×3
• Choose fraction strips rather than a number line to compare 3/8 and 1/4
• Use a ruler and squared paper to verify area by counting squares after calculating l×w

评估问题 / Assessment

当{{name}}做数学题时，是否会选择正确的方法——简单计算用心算，复杂计算用笔算，涉及图形或分数的问题画出示意图？

When {{name}} is working on maths, do they choose the right method — doing simple calculations in their head, using written working for complex ones, and sketching a diagram when a problem involves shapes or fractions?