"Four Mixed Operations" PPT courseware 4

Description

"Four Mixed Operations" PPT courseware 4

teaching objectives

1. Experience the process of trying to calculate the divisions between the four mixed operations and summarizing the order of the four mixed operations.

2. Master the order of the four mixed arithmetic operations, know the value method when the division between the four mixed arithmetic operations cannot be completed, and understand the special situation of 0 in the four arithmetic operations.

3. Form the knowledge structure of the four mixed operations and improve the computing ability in the process of playing the "24-point game".

review review

State the order of operations first, and then calculate.

5×[ 5.6＋（6.9÷0.3）]

＝5×[ 5.6＋23 ]

=5×28.6

=143

Addition, subtraction, multiplication and division are collectively referred to as the four arithmetic operations.

Let’s summarize the order of operations of the four mixed operations together!

1. If a calculation only contains addition and subtraction, it must be calculated from left to right.

2. If a calculation contains addition, subtraction, multiplication and division, the multiplication and division must be calculated first, and then the addition and subtraction.

3． In a calculation with parentheses, calculate what's inside the parentheses first, then what's inside the square brackets, and finally what's outside the square brackets.

Discuss

What are the special cases of 0 in the four arithmetic operations?

Add 0 to any number to get any number;

Subtract 0 from any number to get any number;

0 multiplied by any number is 0;

Dividing 0 by any number results in 0, and 0 cannot be used as a divisor.

practice

1 First tell the order of operations of the following questions, and then calculate.

4.5＋1.43÷1.3－1.23

＝4.5＋1.1－1.23

=5.6-1.23

=4.37

2.4×[（0.8＋3.4）÷0.7 ]

＝2.4×[ 4.2÷0.7 ]

=2.4×6

=14.4

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Update Time: 2024-10-21

This template belongs to Mathematics courseware Hebei Education Edition Fifth Grade Mathematics Volume 1 industry PPT template

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