加法：将两组合并或合在一起

理解加法就是把两组物体合在一起，求出总数

Understand addition as combining or putting together two groups to find the total

学习证据 / Evidence

• 用实物示范“合起来”，并说出总数
• 表演“增加”情境（例如3个孩子先到，又有2个加入）
• 解释加法就是求一共有多少

• Model 'putting together' with physical objects and say the total
• Act out an 'add to' situation (e.g. 3 children arrive, then 2 more join)
• Explain that addition means finding how many altogether

评估问题 / Assessment

如果{{name}}有4辆玩具车，朋友又拿来3辆，他们是否理解加法就是把两组合在一起，并能告诉你现在一共有7辆车？

If {{name}} has 4 toy cars and a friend brings 3 more, do they understand that adding means combining both groups — and can they tell you there are now 7 cars altogether?