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How to draw a mind map by dividing two or three digits by one digit in Unit 1 of the second volume of the third grade of mathematics?
The construction mode of mind map is to determine a central theme, lead out sub-themes, and then divide the sub-themes into levels.

Use the simplest language to determine the mathematical theme to be drawn.

Let's take the measurement of angle as an example. An angle is a figure composed of two rays drawn from a point. So let's learn about rays first. Draw line segments and straight lines with rays and compare their similarities and differences. Let's first mark the key words on the mind map about the important knowledge points of angle.

In this mind map, we know that the definition of light comes from angle, and we can draw the relationship line between angle and light, which is convenient for us to connect knowledge points in series.