一个有趣的动手活动，供学生比较各种物体的重量
This hands-on teaching resource is great for students to compare the weight of different objects. This activity would be great to put in a数学中心。
如何使用此教学资源：
- 切出平衡秤，并使用黄铜紧固件组装。
- 切出对象卡并放在桌子上（面朝下）。
- Students take turns choosing 2 cards.
- 作为一个小组，讨论哪个对象很重，哪个对象是轻的（一些卡片比较会挑战学生的思维，需要更大的讨论）。
- 学生将在规模和调整对象its position accordingly.
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