Improve the arrangement of fractional multiplication and division ratio, embody the new concept of mathematics teaching reform, deepen students' understanding of mathematics knowledge and cultivate students' application consciousness. On the basis of existing knowledge, help students build new knowledge independently. Strengthen intuitive teaching, combine practical operation with visual graphics, and help students understand arithmetic and master methods.

The plan is introduced as follows:

Planning, management terms, from the perspective of disassembling the two Chinese characters "plan", the meaning of "plan" is calculation, the meaning of "plan" is division, and plan is subordinate to achieving goals. The ideographic definition of "plan" is the process and conclusion of analyzing and calculating how to achieve the goal and decomposing the goal into sub-goals.

In management science, planning has two meanings. One is planning work, which refers to the analysis of the external environment and internal conditions of the organization, and puts forward the organizational goals and ways to achieve them in a certain period of time in the future.

The second is the form of plan, which refers to the management documents expressed in words and indicators, and the direction, content and arrangement of actions in different departments and members of the organization in a certain period of time in the future.

The contents of the plan are as follows:

Planning is to predict, arrange and deal with future activities in advance. The purpose of the plan is to achieve the proposed goals, and each plan is aimed at a specific goal.

Therefore, a plan must first define the objectives of the plan. After the goal is clear, the plan must also explain how to do it, who will do it, when to do it, where to do it and how much resources to invest.

The types of plans are as follows:

There are many kinds of plans, which can be classified according to different standards. The main classification criteria are: the importance, time limit, clarity and abstraction of planning. However, according to these classification standards, the types of schemes obtained are not independent of each other, but closely related. Such as short-term plan and long-term plan, strategic plan and operation plan.