"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

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Update Time: 2024-10-21

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

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