"Animal World" PPT courseware 5

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"Animal World" PPT courseware 5

1. Situation introduction

Snowshoe rabbit tail length 0.5 decimeter,

Hainan rabbit tail length 0.50 decimeter,

Which one is longer, the snowshoe hare or the Hainan hare?

Gray squirrel weighs 0.504 kg,

Rock squirrel weight 0.300 kg,

Could the weight of rock squirrels and gray squirrels be written more simply?

What mathematical information do you know from the graph?

2. Cooperation and exploration

Which one is longer, the snowshoe hare or the Hainan hare? what have you found?

Just compare the sizes of 0.5 and 0.50.

Which of the following two statements is correct? Why?

Argument 1: Because 0.50 is two decimal places, 0.5 is one decimal place, and 0.50 is larger than 0.5, so the Hainan rabbit has a long tail.

Statement 2: 0.50 is equal to 0.5, so the tail of the snowshoe hare is the same length as that of the Hainan hare.

Fierce eyes distinguish right from wrong.

(1) Adding 0 or removing 0 from the end of a number will keep the size of the number unchanged. ( )

(2) Add 0 or remove 0 after the decimal point, and the size of the decimal remains unchanged. ( )

(3) Add or remove 0 at the end of the decimal, and the size of the decimal remains unchanged. ( )

Adding or removing 0 from the end of a decimal will keep the size of the decimal unchanged.

0.300=0.3

Removing the 0 at the end of a decimal like this is called simplifying the decimal.

0.504

Can this 0 be removed? Why?

Think about it, what should you pay attention to when rewriting decimals?

0.9 = 0.900

6.07=6.070

5 = 5.000

A. Does not change the size of the original number.

B. You can only add "0" at the end of the decimal.

C. When rewriting an integer into a decimal, first put a decimal point in the lower right corner of the integer's one digit, and then add "0".

3. Independent practice

1. Connect equal numbers.

2. Use yuan as the unit and use two decimal places to express the price of the following products.

3. Judge each of the following questions. Mark the correct ones with √ and the wrong ones with ×.

(1) 5.00 yuan = 5 yuan ( )

(2) 7 yuan = ( )

(3) 8 meters = 8.00 meters ( )

(4) 2.04 tons = 2.4 tons ( )

(5) 4.5 kg = 4.500 kg ( )

When the 0 at the end of the decimal is removed, the size of the decimal remains unchanged.

4. Use the numbers on the card to form a number and meet the following requirements.

①All "0" cannot be removed.

4.0002, 40.002,…

0 is not at the end of the decimal.

②All "0" can be removed.

4.2000, 2.4000…

0 is at the end of the decimal.

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 2 industry PPT template

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