"The rules and applications of moving the decimal point position to the right" Decimal multiplication PPT courseware

Description

"The rules and applications of moving the decimal point position to the right" Decimal multiplication PPT courseware

teaching objectives

1. Combined with specific examples, experience the process of independently exploring the rules of the decimal point position moving to the right and applying the rules to perform calculations, and understand and master the rules of the decimal point moving to the right.

2. Be able to use rules to calculate the multiplication of decimals by 10, 100, and 1000 orally, and be able to rewrite the unit number represented by the decimal into a smaller unit number or a complex number.

3. Actively participate in mathematics activities, gain successful experience in using existing knowledge to solve problems, and cultivate judgment and induction abilities.

1 button is 5 cents, how much is 10 buttons?

1 button costs 5 cents, 10 buttons total 5 cents, 5 cents can be written as 0.05 yuan, and 5 cents can be written as 0.5 yuan.

Multiplication formula: 0.05×10=0.5 (yuan)

Answer: 0.5 yuan for 10 buttons.

1 button costs 5 cents, 100 buttons total 5 yuan.

Multiplication formula: 0.05×100=5 (yuan)

Answer: 100 buttons cost 5 yuan.

1 button costs 5 points, 1,000 buttons total 50 yuan.

Multiplication formula: 0.05×1000=50 (yuan)

Answer: 50 yuan for 1,000 buttons.

Discuss

Observe the following calculations, what do you find?

0.05×10=0.5 (yuan)

0.05×100=5 (yuan)

0.05×1000=50 (yuan)

The rule of moving the decimal point position to the right

A number is expanded to 10 times its original size

Move the decimal point one place to the right

A number is expanded to 100 times its original size

Move the decimal point two places to the right

A number is expanded to 1000 times its original size

Move the decimal point three places to the right

Rewrite the length and width of the desk in centimeters?

method one:

1 meter is 100 centimeters and 0.3 meters is 30 centimeters.

Rewriting 1.3 meters into centimeters is 100 centimeters plus 30 centimeters, which is 130 centimeters.

1.3 meters = 100 cm + 30 cm = 130 cm

Method Two:

The increment between meters and centimeters is 100.

When rewriting meters into centimeters, multiply directly by 100, multiply 1.3 by 100, and move the decimal point of 1.3 two places to the right to get 130.

1.3×100=130 (cm)

practice

1. Fill in the form.

2.0.32 tons = ( ) kilogram

1.96 liters = ( ) milliliters

4.85 meters = ( ) meters ( ) centimeters

6.09 tons = ( ) tons ( ) kilograms

3.3.5×10＝ 9.6×100＝

0.786×10＝ 0.479×100＝

0.07×1000＝

17.6×1000＝

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File Info

Update Time: 2024-10-03

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

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