加法和减法（8岁及以上）
Adding and subtracting (age 8+)
使用规范的竖式加法和竖式减法，计算不超过四位数的加减法。
Add and subtract numbers with up to four digits using formal written methods of columnar addition and subtraction
学习证据 / Evidence
- 排列并计算一个不超过四位数的竖式加法题
- 排列并计算一个需要跨多列退位的竖式减法题
- 使用估算或逆运算来检查答案
- Set out and solve a columnar addition with up to four-digit numbers
- Set out and solve a columnar subtraction with exchange across multiple columns
- Check the answer using estimation or inverse operations
评估问题 / Assessment
{{name}}能把像‘3,842 + 1,765’或‘4,301 − 2,658’这样的算式按列对齐，并正确完成计算——包括跨多列的进位和退位吗？
Can {{name}} line up a sum like '3,842 + 1,765' or '4,301 − 2,658' in columns and work through it correctly — carrying and borrowing across multiple columns?