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

Description

"The rules and applications of moving the decimal point position to the left" 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 left and applying the rules for calculation.

2. Understand and master the rules of moving the decimal point to the left, be able to apply the rules to calculate decimal divisions by 10, 100, and 1000 orally, and be able to rewrite smaller unit numbers or complex numbers into single numbers represented by decimals.

3. Actively participate in mathematics activities, experience the practice of knowledge, and gain successful experience in mathematics learning activities.

If a 5-meter-long ribbon is divided into 10 equal parts, how many meters will each part be?

Divide the 5-meter-long ribbon into 10 equal parts, each part is 5 decimeters, and 5 decimeters can be written as 0.5 meters.

Division formula: 5÷10=0.5 (meters)

Answer: Divide the 5-meter-long ribbon into 10 equal parts, each part is 0.5 meters.

Divide a 5-meter-long ribbon into 100 equal parts, each part is 5 centimeters, and 5 decimeters can be written as 0.05 meters.

Division formula: 5÷100＝0.05 (meters)

Answer: Divide a 5-meter-long ribbon into 100 equal parts, each of which is 0.05 meters.

Divide a 5-meter-long ribbon into 1,000 equal parts, each part is 5 mm, and 5 decimeters can be written as 0.005 meters.

Division formula: 5÷1000＝0.005 (meters)

Answer: Divide a 5-meter-long ribbon into 1,000 equal parts, each of which is 0.005 meters.

The rule of moving the decimal point position to the left

Shrink a number to 1/10 of its original size

Move the decimal point one place to the left

Shrink a number to 1/100 of its original size

Move the decimal point two places to the left

Shrink a number to 1/1000 of its original size

Move the decimal point three places to the left

give it a try

Simply write down the scores for each of the following questions, and then use a calculator to check them.

53.8÷10 = 53.8÷100 = 53.8÷10 00=

53.8÷10 =5.38

53.8÷100 =0.538

53.8÷1000, move the decimal point of 53.8 three places to the left. There are not enough digits. What should I do?

If there are not enough digits, add a 0 in front of the integer part.

53.8÷1000＝0.0538

When there are not enough digits, 0 should be used to fill the bits.

Use the rule of moving the decimal point position to the left:

The rate of progress between meters and centimeters is 100. To rewrite centimeters and meters into meters, divide by the rate of 100. 85÷100 means reducing 85 to 1/100 of its original value. Moving the decimal point two places to the left is 0.85.

85 cm = 0.85 (meter)

practice

1.350 grams = ( ) kilogram

720 ml = ( ) liter

9 tons 20 kilograms = ( ) tons

3 liters 450 ml = ( ) liter

2. Fill in the appropriate numbers in the brackets below.

The load capacity is 4500 kilograms, or ( ) tons.

The total length is 42 kilometers and 195 meters, which is ( ) kilometers.

3.0.12×100＝ 3.65÷1000＝

0.9×1000＝ 0.42÷100＝

19÷100＝

90.2×100＝

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Update Time: 2024-10-02

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

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