"Animal World" PPT Courseware 6

Description

"Animal World" PPT Courseware 6

1. Situation introduction

The body length of a hummingbird is 0.05 meters, and the egg weight is 0.46 grams.

What does 0.05 mean?

An albatross egg weighs 0.365 kilograms and its wings are 3.6 meters long.

What does 0.365 mean?

What mathematical information do you know from the picture?

2. Cooperation and exploration

The body length of a hummingbird is 0.05 meters. What does 0.05 mean?

Do you know what 0.1 and 0.01 each represent?

1 square piece of paper,

Divide into 10 equal portions,

One portion is 1/10.

Expressed as a decimal, it is 0.1.

What is a decimal? What are the units of counting for decimals?

Numbers like 0.1, 0.05, 0.365... that are used to express tenths, hundredths, thousandths... are called decimals.

The counting units of decimals include one-tenth, one-hundredth, one-thousandth... recorded as 0.1, 0.01, 0.001...

give it a try

Think about it, where have you seen decimals in your life? Can you tell me what these decimals mean?

My height is 1.41 meters.

My weight is 39.4kg.

do you know?

Decimals were first proposed and used in our country. As early as the third century AD, when solving a mathematical problem, Liu Hui, an ancient Chinese mathematician, proposed that the parts of integers below the single digit that cannot be labeled are called Hui numbers.

The name of decimals was proposed by Zhu Shijie, a numerologist of the Yuan Dynasty in my country in the 13th century AD. In the West, decimals appeared much later. It was not until the 16th century that the German mathematician Kravis first used the decimal point as a mark to mark the boundary between the integer part and the decimal part.

3. Independent practice

1. Fill it out.

(1) 0.6 means that the whole "1" is divided equally into ( ) parts, indicating such ( ) parts.

(2) 0.57 means that the whole "1" is evenly divided into ( ) parts, indicating such ( ) parts.

(3) 0.268 means that the whole "1" is evenly divided into ( ) parts, indicating such ( ) parts.

2. Use fractions and decimals to represent the shaded parts of the figure below.

3. Fill in the appropriate fraction or decimal in □.

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Update Time: 2024-11-17

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

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