Step 1: Divide 300 blocks into 3 blocks, each block is 100 block;

Step 2: Divide 60 into 3 parts, each with 20 pieces;

Step 3: Divide the nine into three parts, three for each part.

Step 4: First divide 400 blocks into 4 blocks, each block is 100 block;

Step 5: Divide 120 into 4 parts, each with 30 pieces;

Step 6: Divide the four into four parts, each part is 1.

Methods of learning mathematics:

1, passive learning.

After entering junior high school, many students, like primary schools, have strong dependence, follow the teacher's inertia and cannot grasp the initiative of learning. It is manifested in the uncertain plan, waiting for class, not previewing before class, not knowing the teacher's class content, being busy taking notes in class and not hearing the "doorway".

You can't learn law.

Teachers usually explain the ins and outs of knowledge in class, analyze the connotation of concepts, analyze key and difficult points, and highlight thinking methods. However, some students didn't concentrate in class, didn't catch the main points or didn't catch them at all. They just do their homework in a hurry, do problems at random, have a little knowledge of concepts, laws, formulas and theorems, imitate mechanically and memorize them by rote.

3, do not pay attention to the foundation.

Some students who "feel good about themselves" often despise the study and training of basic knowledge, basic skills and basic methods, and often only know how to do it, but they are very interested in difficult problems to show their "level". They are too ambitious, pay more attention to "quantity" than "quality" and fall into the sea of questions. In regular homework or exams, either calculus is wrong or it gets stuck halfway.