First, the unit thinking method of addition
Addition is one of the most basic operations in mathematics, which can be used to calculate the sum of two or more numbers. When learning addition, the unit thinking method can help students better understand and master the addition operation.
Introduction of 1. unit idea
Before learning addition, it is very important to introduce the idea of unit. Unit refers to a certain quantity or measure, which can be quantity, length, quality, etc. The combination of addition and unit can help students to add on the basis of common units and establish intuitive concepts.
2. Unit thinking practice
Through practical operation and practice, students can apply the idea of unit addition. For example, you can use small pieces, balls or other common practical items in daily life to let students place and count themselves and cultivate their intuitive feeling and understanding of addition.
For example, let students use small pieces to simulate apple trees in an orchard. There are several apples in each tree, and then two or more apples are put together separately. Ask the students to count how many apples there are. Through this practical operation, students can feel that addition is a process of combining quantities of different units.
3. The application of unit thinking
Unit thinking is also very useful in solving practical problems. For example, let students solve the shopping problem, and what is the total price of buying a variety of items. Guide the students to take the price of each item as the unit, and then add all the prices to get the total price. Through such practical application, students can apply unit thought to the process of solving practical problems and improve their ability to solve problems.
Second, the unit thinking method of subtraction
Subtraction is an operation corresponding to addition in mathematics, which is used to calculate the difference or remainder of two numbers. When learning subtraction, unit thinking method can also help students better understand and master subtraction operation.
1. Application of unit thinking
When learning subtraction, we also need to introduce the idea of unit. Combining subtraction with units can help students to perform subtraction on the basis of commonly used units, thus establishing an intuitive concept.
2. Unit thinking practice
Students can apply the idea of unit to subtraction through practical operation and practice. Unlike addition, subtraction calculates the residual by subtracting one or more units.
For example, ask students to simulate the food plate in the cafeteria. Suppose students have five food plates, take 1 plate from them at a time, and then calculate the number of remaining plates. Through practical operation, let students intuitively feel how subtraction calculates the residual amount.
3. The application of unit thinking
The idea of unit can be applied to solving problems in real life. For example, let students solve the problem of shopping change. What's the difference between the amount they need to pay when shopping and the amount they actually pay? Guide students to take the amount they need to pay when shopping as the unit, and then calculate the actual amount paid.