"Harvest Season" PPT courseware 8

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"Harvest Season" PPT courseware 8

A: I bought 4 notebooks for 12 yuan.

B: I bought 2 notebooks for 6 yuan.

C: I bought 3 notebooks for 9 yuan.

Ding: I bought 6 notebooks for 18 yuan.

Can you separately calculate the price of the laptops they purchased?

12÷4=3

6÷2=3

9÷3=3

18÷6=3

Self-study guide:

1. Calculate columns and fill in the form (complete independently)

2. Group discussion:

(1) Observe the data in the table and talk about what you found?

(2) Observe how the dividend and divisor in the calculation change, and what do you find?

If the dividend and divisor are multiplied by the same number at the same time, the quotient remains unchanged.

If the dividend and divisor are divided by the same number at the same time, the quotient will not change.

I find:

If the dividend and divisor are multiplied or divided by the same number (except 0) at the same time, the quotient remains unchanged.

This is the invariable nature of quotient.

Classmates, why is the Monkey King smiling?

First time: 303

Second time: 300 30

The third time: 600 60

Because the monkey king used the constant law of business to deceive the little monkeys, each little monkey still got 10 peaches.

first round

Which formulas are equal to "450÷15"

1)(450÷3)÷(15÷3) ( )

2) (450÷4)÷(15×4) ( )

3) (450×2)÷(15×3) ( )

4) (450×5)÷(15×5) ( )

5) 450 ÷ (15 ÷ 3) ( )

6) (450÷4)÷(15÷7) ( )

Second level

⑴In a division equation, if the dividend is divided by 5, the divisor is also divided by 5, the quotient ( ).

⑵In a division equation, if the dividend is multiplied by 10, to keep the quotient unchanged, the divisor ( ).

⑶In a division equation, if the divisor is divided by 100, the quotient must remain unchanged, the dividend ( ).

The third level:

According to 132÷12=11, quickly write down the quotients of the following questions and explain the reasons.

1320÷ 120 = 264÷ 24 =

13200÷ 1200= 2640÷ 240=

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Update Time: 2024-09-10

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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