加法与减法（10岁以上）
Adding and subtracting (age 10+)
在情境中解决涉及加法和减法的多步问题，判断并选择使用哪些运算和方法，并说明理由；数字范围可达10,000,000，并包含小数。
Solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why, with numbers up to 10,000,000 and decimals
学习证据 / Evidence
- 解决一个涉及超过1,000,000的数的加减两步应用题。
- 在多步问题中选择心算、笔算或计算器等方法，并说明选择的理由。
- 解读现实情境，判断在多步计算中需要使用哪些加法或减法运算。
- Solve a two-step word problem involving addition and subtraction of numbers beyond 1,000,000
- Choose between mental, written, and calculator methods for a multi-step problem and justify the choice
- Interpret a real-life context to identify which addition/subtraction operations are needed across multiple steps
评估问题 / Assessment
如果给{{name}}一个涉及大数或小数的复杂应用题——比如计算几件物品的总价——{{name}}能否正确规划并完成所有步骤？
If {{name}} is given a complicated word problem involving large numbers or decimals — like calculating the total cost of several items — can they plan and carry out all the steps correctly?