Qingdao Edition Sixth Grade Mathematics Volume 2

Description

"Happy Farm Tour" PPT Courseware 4

1. Review and sorting out

What numbers have we learned? Let's sort it out together?

integer natural number

decimal

Score Percent

Positive and negative numbers

Natural number

Numbers that represent the number of objects, such as: 0, 1, 2, 3... are all natural numbers.

Natural numbers are parts of integers.

integer

Positive integer (such as: 1, 2, 3 ·······)

zero

Negative integers (such as: -1, -2, -3 ······)

Fraction

Divide the unit "1" evenly into several parts, and the number representing one or several parts is called a fraction. One part of it is the fractional unit of this fraction.

Percent expresses what percentage of another number one number is and is a special fraction.

2. Discussion and exchange

Why do we need to learn integers, fractions, decimals...these numbers? Think about it, what would happen if numbers were missing in life?

The sixth national census at 0:00 on November 1, 2010 was the standard time point. The total registered national population was 1339,724,852 people. Compared with the fifth national census in 2000, there was an increase of 73.9 million people in ten years, an increase of 5.84 %, with an average annual growth rate of 0.57%, 0.5 percentage points lower than the average annual growth rate of 1.07% from 1990 to 2000. Data show that my country's population growth has been in a low-fertility stage for the past ten years.

If numbers are missing in life, the social order will not function normally, the world will become chaotic, and the consequences will be unimaginable!

3. Application and reflection

1. Read it.

(1) Li Li ate a watermelon 0.167.

(2) Wang Ping conducted a soybean germination test and the germination rate was 98%.

(3) Xiaoqiang bought 2 pencils and spent 1.6 yuan.

(4) The lowest temperature in Xinjiang, my country reaches -40℃.

Can you give similar examples in your life?

Is it appropriate to use decimals to express how much watermelon Li Li ate?

2. Fill it out.

(1) A number consists of 7 , this number is ( ), and its reciprocal is ( ).

(2) Divide 4 kilograms of raisins equally into 8 packages, each package is ( ) kilogram, and each package accounts for ( ) of the total.

(3) 2÷( )= 0.4 = = =( )%

(4) 5.0529 to two decimal places is ( ).

(5) Hualian Commercial Building sells woolen sweaters of a certain brand at a 10% discount. The 10% discount means that the current price is ( )% of the original price.

3. Fill in the appropriate numbers in the brackets.

4. Fill in the blanks.

(1) In the number 430097800, 3 is in the ( ) digit, and the number in the tens of thousands digit is ( ). If the mantissa after ten thousand is omitted and rounded, the approximate number is approximately ( ) ten thousand.

(2) A number consists of 900 million, 8 hundreds of thousands, 50,000, and 2 hundreds. This number is written as ( ) and pronounced as ( ).

(3) There are prime numbers within 10 ( ).

Total numbers within 10 ( ).

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Update Time: 2024-10-20

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