"Laws of Addition" Laws of Operation PPT courseware

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"Laws of Addition" Laws of Operation PPT courseware

1. Create situations and introduce new lessons

Questions: 1. Can you do calculations in equations? 40＋56＝96 or 56＋40＝96

2. Why use addition calculation?

2. Preliminarily perceive the commutative law of addition in the situation

(1) Try to solve the problem

Questions: 1. Are both 40+56 and 56+40 correct?

2. Are these two equations equal?

(2) Verification rules in enumeration

Question: Can you come up with any other equations like this? (Students give examples and the teacher writes them on the blackboard, about four groups.)

(3) Summarize the rules in comparison

Question: 1. Have you finished writing a calculation like this?

2. What do these calculations have in common?

3. Can you express the commutative law of addition in the way you like? (Show everyone’s representations and let students compare on their own.)

3. Preliminarily perceive the additive associative law in the situation

(1) Try to solve the problem

Question: Can you solve the problem raised by Uncle Li?

(2) Transfer learning experience and generalize rules

Questions: 1. Can you come up with any other equations like this? (Students give examples and the teacher writes them on the blackboard, about four groups.)

2. Overall observation, why are these calculations equal? (They are all sums of the same three numbers.)

3. What do these calculations have in common? (To add three numbers, add the first two numbers first, or add the last two numbers first, and the sum remains unchanged.)

4. Consolidate practice and improve understanding

1. Apply the commutative law of addition and connect them with lines.

2. Fill in the blanks according to the commutative law of addition.

300＋600＝600＋( ) ( )＋65＝65＋35

3. Fill in the blanks according to the additive associative law.

(25+68)+32＝25+(+)

130＋（70＋4）＝（130＋）＋( )

5. Assign homework

Homework: Exercise 5 on page 19, Question 2.

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"Law of Addition" Law of Operation PPT Courseware 2:

"Laws of Addition" Laws of Operation PPT Courseware 2 1. Review Introduction Tell us what laws of operation are used in the following calculations. 76+18＝18+76 56+72+28＝56+(72+28) 31+67+19＝31+19+67... 2. Creation...

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Update Time: 2024-11-20

This template belongs to Mathematics courseware People's Education Press fourth grade mathematics volume 2 industry PPT template

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