两步加减法问题
Two-step addition and subtraction problems
在具体情境中解决两步加减法问题，判断并说明使用哪种运算和方法，以及为什么这样做。
Solve addition and subtraction two-step problems in contexts, deciding which operations and methods to use and why
学习证据 / Evidence
- 识别出解决情境问题所需的两步计算。
- 根据数字特点，为每一步在口算和笔算之间做出选择。
- 解释所选择的运算和方法为什么合适。
- Identify the two steps needed to solve a contextual problem
- Choose between mental and written methods for each step based on the numbers
- Explain why the chosen operations and methods are appropriate
评估问题 / Assessment
如果{{name}}读到一个需要两步计算的应用题——比如算一算买两件商品后应找回多少零钱——{{name}}能规划出要先算什么、再算什么吗？
If {{name}} reads a word problem with two steps — like working out change from a shopping trip with two items — can they plan which calculations to do and in what order?