Wang Ming's height is 140 cm. We need to change the height of the door from meters to centimeters because Wang Ming's height is given in centimeters. 2 meters equals 200 centimeters.

To find out how many centimeters Wang Ming is shorter than the door, we only need to subtract the height of Wang Ming from the height of the door.

Namely: 200 cm (door height)-140 cm (height of Wang Ming) =60 cm.

So Wang Ming is 60 centimeters shorter than the door.

It should be noted that here we use centimeters as the unit of measurement, because in daily life, we usually use centimeters to describe such a small size. Of course, if necessary, we can also convert it into meters or other units.

Through simple subtraction, we can know how many centimeters Wang Ming is shorter than the door. This is not only a simple math problem, but also a problem that we often need to solve in our daily life.

Mathematical mind map:

Mathematical mind map is a graphical tool used to display mathematical concepts, relationships and problem-solving processes. It can help you organize and understand mathematical knowledge intuitively. Here are the simple steps to create a mathematical mind map:

1. Determine the topic: First, choose the math topic you want to discuss, such as algebra, geometry, probability, etc.

2. Central node: find a central point on the canvas to represent the theme. For example, if you choose algebra, the central node can be a big "algebra" label.

3. Branches: Starting from the central node, draw several branches, and each branch represents a sub-topic. Algebra, for example, can be divided into sub-topics such as equations, inequalities and functions.

4. Relationship: Draw a relationship line between each sub-topic to show the relationship between them. For example, functions are related to concepts such as derivatives and integrals.

5. Details: For each sub-topic, further break it down into smaller concepts. For example, sub-concepts such as linear equation and quadratic equation can be added under the branch of the equation.

6. Examples: Provide examples or applications for each concept to deepen understanding. For example, under the branch of quadratic equation, a concrete example of quadratic equation can be added.

7. Process: For some problems, you can draw the steps to solve the problem. For example, in the process of solving a linear equation, each step can be marked.

8. Summary: At the end of the mind map, add a summary statement to summarize the main concepts and relationships.

9. Colors and labels: Use different colors and labels to distinguish different types of concepts, making mind maps clearer.

10, continuous optimization: As you deepen your knowledge of mathematics, you can constantly adjust and optimize your mind map as needed.

Mathematical mind map can help you establish a clear mathematical knowledge system and improve the learning effect. As long as you follow the above steps, you can easily create a personalized mathematical mind map.