数学推理论证（8岁以上）
Justifying mathematical reasoning (age 8+)
构建并呈现多步骤的数学论证；评析他人的推理，并清楚地解释某种方法为什么有效或失效。
Construct and present multi-step mathematical arguments; critique the reasoning of others and explain clearly why a method works or fails
学习证据 / Evidence
- 运用“份数越多，每份越小”的想法解释为什么 1/3 > 1/5
- 找出并解释同伴在带借位的竖式减法中的错误
- 呈现一条推理链：因为 6×8=48，且 6×2=12，所以 6×10=60，因此 6×8=60−12=48
- Explain why 1/3 > 1/5 using the idea that more parts means smaller pieces
- Find and explain an error in a peer's column subtraction with exchanges
- Present a chain of reasoning: since 6×8=48 and 6×2=12, then 6×10=60 so 6×8=60−12=48
评估问题 / Assessment
如果同学声称“乘以一个分数后答案不可能变大”，{{name}}能否仔细思考这是否总是成立，并举例支持或反驳这个说法？
If a classmate claims "you can't multiply a fraction and get a bigger answer", can {{name}} think through whether that's always true — and give an example to support or challenge the claim?