"Animal World" PPT Courseware 2

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"Animal World" PPT Courseware 2

Decimals in life

The height of the desk is 0.78 meters.

China's population has exceeded 1.34 billion

Ostrich eggs weigh 1.65 kg

China's land border is 22,800 kilometers long, and its mainland coastline is about 18,000 kilometers long.

0 . 5 7 pronounced as: zero point five seven

1 3. 4 is read as: thirteen point four

3 . 0 2 1 is pronounced as: three point zero two one

6 2 0 . 2 8 is read as: six hundred and twenty point two eight

Collaboration with deskmates:

1. Please use the expressions of 1/10, 0.1, 1/100, 0.01

The meaning of , first use decimals to express the colored part, and then color

Create a decimal you like.

2. The key is to write clearly what do they mean?

Numbers like 0.1, 0.25, 0.365... used to represent tenths, hundredths, thousandths... are called decimals

do you know?

Decimals were first proposed and used in our country. As early as the 3rd century, when solving a mathematical problem, Liu Hui, an ancient Chinese mathematician, proposed that the parts below the single digit of an integer that cannot be labeled are called differentials.

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

Consolidate and fill in the blanks:

1. 0.1 is one ( ).

2. There are ( ) 0.1 in 0.7; there are 7 0.01 in ( )

3. 8 digits ( ) are 0.8; 10 digits 0.1 are ( )

4. 0.497 is composed of ( ) 0.1, ( ) 0.01 and ( ) 0.001

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Update Time: 2024-07-02

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

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