In order to understand acute angle, right angle and obtuse angle, make a movable angle. The method is as follows:

First cut it into two pieces with cardboard, or use popsicle sticks or straws;

Second, prepare a thumbtack and nail one end of two strips together;

Third, if the other end can move, it can easily pose acute angles, right angles and obtuse angles.

Extended data:

Let primary school students make simple math teaching AIDS, which is beneficial to improve their attention and learning efficiency. It can not only help students solve key problems in class, strengthen some knowledge points, but also mobilize students' intellectual factors and attention, thus developing students' intelligence, cultivating students' ability, improving learning efficiency in an all-round way and improving teachers' teaching quality, with twice the result with half the effort.

Self-made and self-made teaching AIDS can also cultivate students' aesthetic consciousness and taste, which is conducive to establishing a correct world outlook. In the process of making, you need to devote yourself wholeheartedly, so it is also a process of training, testing and improving students' quality in all aspects.