成比例数值
通过对齐数字排列来发现成比例数值模式。如果你给出错误答案，点会从数线上弹开。
综合能力提高
自己或与别人一起回答这些开放式问题，以形成更深层次的数学联系。
Stretch the top number line and see where the dots fall. What do all of the expressions of the top number line have in common? How are each of these expressions different?
Describe how you decided where to let the points drop so they fill the circles.
When the points fill the circles, how are the expressions of the top number line related to the number of bottom number line?