"Finding Approximate Numbers" PPT courseware for understanding larger numbers

Description

"Finding Approximate Numbers" PPT courseware for understanding larger numbers

teaching objectives

1. Using the statistical data of some ethnic minority populations in my country, go through the process of rewriting larger numbers into approximate numbers in units of "ten thousand".

2. Understand the meaning of "rounding method" and be able to use "rounding method" to rewrite an exact number into an approximate number with the unit of "ten thousand".

3. Understand the wide application of approximate numbers in real life, and feel the close connection between mathematics and life.

situation creation

1. Do you know how many ethnic groups there are in our country?

2. In addition to the Han people, do you know what other ethnic groups are called?

3. Which ethnic group has the most number recognition?

4. Do you know why these ethnic groups are called ethnic minorities?

Explore new knowledge

The following is the population of some ethnic minorities released by my country's sixth national census in 2010.

How many ethnic minorities are there in the picture? Which ethnic groups are they? How many people are there in each?

Can you rewrite them as numbers in "thousands"?

The Naxi population is approximately 330,000.

The Mongolian population is approximately 5.98 million.

To rewrite an exact number into an approximate number, rounding is usually used.

practice

1. (1) Determine which of the following numbers is an approximate number and which number is an exact number.

(2) Rewrite the above number into an approximate number in units of "ten thousand".

2. Rewrite the results of the sixth national census of Hong Kong and Macao in 2010 into approximate numbers in units of "ten thousand".

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Update Time: 2024-11-22

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

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