Qingdao Edition Fifth Grade Mathematics Volume 1

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"Traveling to the Three Gorges" PPT courseware 2

1. Situation introduction

The total length of the five-level ship lock is 6.4 kilometers. How many kilometers is the average length of each level of ship lock?

It takes 2.5 hours for a cruise ship to pass through level 5 locks. What is the average time to pass through each level of lock?

What mathematical information do you know from the picture?

What questions can you ask based on this information?

2. Cooperation and exploration

What is the average time to pass through each lock level in hours?

2.5÷5 =0.5(hour)

Think about it, how do you calculate division when the divisor is a decimal?

Calculated according to the method of integer division. The decimal point of the quotient aligns with the decimal point of the dividend.

If the units digit is not enough to quotient 1, write "0" to fill the digit, click on the decimal point and continue dividing.

If there is a remainder at the end of the dividend, add "0" after the remainder to continue division.

3. Independent practice

1. Calculate vertically.

4.5÷5= 0.9 0.96÷8=0.12 1.75÷7=0.25 1.08÷6=0.18

2. A sharp eye distinguishes right from wrong.

(1) A ship travels an average of 50 kilometers per hour. How many hours does it take to travel from Wuhan to Nanjing?

(2) What other questions can you ask?

①How many hours does it take to get from Chongqing to Yichang?

652÷50 =13.04 (hours)

②How many hours does it take to get from Yichang to Wuhan?

626÷50 =12.52 (hours)

③How many hours does it take to get from Nanjing to Shanghai?

392÷50 =7.84 (hours)

5. Return the pellets to the warehouse.

①5.4÷6 ②4.2÷2 ③11.7÷9 ④17.6÷22

⑤4.8÷4 ⑥8.64÷9 ⑦6.21÷3 ⑧3.42÷6

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For more information about the "Visiting the Three Gorges" PPT courseware, please click the "Visiting the Three Gorges" ppt tab.

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Update Time: 2024-11-23

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