"Approximate Numbers" PPT Courseware 2

Description

"Approximate Numbers" PPT Courseware 2

Which of the numbers in the following practical questions are approximate and which are exact?

Approximate number: A number that is very close to the actual number.

Exact number: A number that exactly matches reality.

1. There are 55 students in the first class of junior high school (1)

2. The radius of the Earth is approximately 6370 kilometers

3. The People’s Republic of China currently has 31 provincial-level administrative units

4. Xiao Ming’s height is nearly 1.6 meters

Example 1: Find the approximate number of each number using rounding method

(1) 1.538 (accurate to 0.01) 1.538≈1.54

(2) 0.3654 (accurate to 0.01) 0.3654 ≈ 0.37

(3) 15.96 (accurate to tenths) 15.96 ≈16.0

(4) 257.47 (or accurate to single digit) 257.47 ≈ 257

Find the approximate number of each number using rounding method

(1) 2.014723 (accurate to percentile)

(2) 0.72032469 (accurate to ten thousandths)

(3) 7209.493 (accurate to single digit)

(4) 980492 is accurate to the tens of thousands (or accurate to the thousands)

concept

Approximate number: A number that is close to the actual value is called an approximate number.

Accuracy: Generally speaking, to which digit an approximate number is rounded, it is said to which digit the number is accurate.

Significant figures: For an approximate number, starting from the first number on the left that is not 0, and ending with the exact number, all numbers are called the significant figures of the number.

summary

1. Master the concepts of approximate numbers and significant figures

2. Master the rounding method and take approximate numbers as required

3. Writing format of approximate numbers and significant figures

Keywords: Approximate numbers teaching courseware, Hebei Education Edition eighth grade mathematics volume PPT courseware download, eighth grade mathematics slide courseware download, approximate numbers PPT courseware download, .PPT format;

For more information about the "Approximate Numbers" PPT courseware, please click the "Approximate Numbers ppt" tab.

"Approximate Numbers" PPT courseware 3:

"Approximate Numbers" PPT Courseware 3 August 1, 2006, 3 days, about 4.3 million yuan Do you think there is any difference between these numbers that appear in life? In life, we need not only accurate numbers but also approximate numbers! What methods have we learned to obtain approximate numbers? rounding..

"Approximate Numbers" PPT courseware:

"Approximate Numbers" PPT courseware Learning objectives: Understand the concept of approximate numbers. Able to obtain approximate numbers as required and indicate the precise digits of the approximate numbers. Understand the application of approximate numbers in real life. Let students feel that mathematics comes from life and serves life. How do these numbers...

"Finding Approximate Numbers" PPT courseware for understanding larger numbers:

"Finding Approximate Numbers" Understanding Larger Numbers PPT Courseware Teaching Objectives 1. Use the statistical data of some ethnic minority populations in my country to experience the process of rewriting larger numbers into approximate numbers in units of thousands. 2. Understand the meaning of rounding and be able to use rounding to convert an exact...

File Info

Update Time: 2024-10-02

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

Preview