1. According to the specific situation, experience the inquiry process of writing one digit divided by two digits, and understand the arithmetic of writing division.

2. Master the writing method and vertical writing method and format of dividing one digit by two digits and quotient by two digits.

3. Take an active part in mathematics activities to enhance the curiosity and thirst for knowledge about mathematics.

Key points: master the written calculation method of dividing one digit by two digits and making the quotient two digits.

Difficulties: Understand the arithmetic of pen division.

A, a number divided by two digits written calculation method.

1. Import problem.

2. Observe the information diagram, find out the needed mathematical information, and understand the juxtaposition of problems and meanings.

As can be seen from the picture, there are 42 trees planted in the two classes in Grade Three. To find the average number of trees planted in each class is to divide 42 trees into two parts and find the number of each part. The formula is 42÷2 divided by.

3. Understand the arithmetic and calculation steps of 42÷2 with a stick.

Two, a number divided by two digits (the first dividend is not divisible) and the calculation method of division.

1. Find information and understand the juxtaposition of questions and meanings.

In the fourth grade, two classes planted 52 trees. To find the average number of trees planted in each class is to divide 52 trees into two parts and find the number of each part. The formula is 52÷2 divided by division.

2. Explore the arithmetic of 52÷2 with the help of a stick.

3. Check whether 52÷2=26 is correct.

Summary:

1. A written calculation method of dividing one digit by two digits (the first digit of the dividend cannot be divisible by digits): When the number on the tenth digit of the dividend cannot be divisible by digits, after the number on the tenth digit of the dividend is divided by one digit, the remaining number should be combined with the number on the digit of the dividend to continue the division.

2. Calculation method of division without residue: quotient× divisor = dividend.