1. First, draw our title "Mathematical Mind Map" on the top right of the screen. Determine the overall layout of the whole picture in advance.

2. Draw a small box in the middle of the picture, draw two children on the box, then draw two square borders on the right side of the picture, connect the borders with the small box in the middle, and decorate some numbers and pencils on the right border.

3. Draw three square borders on the left and bottom of the picture, a little girl on the left of the bottom border and a rabbit on the top border to make the mind map more interesting.

4. Next, you can start drawing. Colour the box in the middle light yellow, the bottom border on the left light blue, the characters' hair brown, the clothes yellow, red and blue, the pencils blue and green, and the rabbits pink.

5. Paint the title in red, blue and green, with light red and light green on the left, light orange and yellow on the right, and light blue, green and red around the numbers. 6. Finally, draw a grid line on the border and tidy it up, and a good-looking mathematical mind map will be completed.

The fourth grade mathematical mind map includes the meaning and nature of decimals, observation objects, operation rules, four operations and so on. The main knowledge points are summarized here. ?

Concept is the cornerstone of learning mathematics. Learning concepts (including theorems and properties) requires not only knowing why, but also knowing why. We should not only remember the concepts, but also understand their background. For every definition and theorem, we must know where it comes from and where it is applied. Only in this way can we learn math well.