Decimal multiplication and division is an important content of primary school mathematics. In the process of learning decimal multiplication and division, mind maps can be used to help clarify ideas and facilitate memory. The following introduces the method of making the decimal multiplication and division mind map in Unit 5 of the first volume of the fifth grade of Jiangsu Education Press.

1. Decimal Multiplication Mind Map Making Method

(1) Subject: decimal multiplication

(2) Branch 1: decimal times integer

Steps of multiplying decimal by integer: first, ignore decimal point and calculate by ordinary multiplication; In the result, the decimal point moves to the left.

(3) Branch 2: Decimal Multiplies Decimal

Steps of multiplying decimals by decimals: Ignore decimals and calculate by ordinary multiplication; In the result, the decimal point is moved to the left by the sum of the decimal places of two numbers.

2. Decimal division mind map making method

(1) Subject: Fractional Division

(2) Branch 1: Divided by integer

Divide by integer: first move the decimal point to the right to make the divisor an integer; Then, calculate by ordinary division; Finally, move the decimal point of the quotient to the left.

(3) Branch 2: Divide by Decimal

Divide by Decimal: Multiply the divisor by an integer equal to its digits to make it an integer; Then, calculate by ordinary division; Finally, move the decimal point of the quotient to the left by divisor decimal places.

The above is the method of making the decimal multiplication and division mind map in Unit 5 of the first volume of the fifth grade of Jiangsu Education Press. Through the form of mind map, the steps of decimal multiplication and division are clearly presented, which is convenient for students to understand and remember. At the same time, mind map is also an effective learning tool, which can help students master decimal multiplication and division faster and better.