"Natural Numbers" Multiples and Factors PPT Courseware

Description

"Natural Numbers" Multiples and Factors PPT Courseware

teaching objectives

1. Combine with specific situations and experience the process of understanding natural numbers, odd numbers, and even numbers.

2. Understand the characteristics of natural numbers, and be able to use points on a straight line to represent natural numbers; know odd and even numbers, and be able to judge whether a number is odd or even.

3. Feel the close connection between mathematics and daily life, and stimulate interest in learning mathematics.

Numbers like 1, 2, 3, 4, 5, 6, 7...are all natural numbers.

1. When can’t you see the stars?

2. If you can’t see a single star, what number should you use to represent it?

Not a single star is visible, represented by 0, which is also a natural number.

Natural numbers can be represented by points on a straight line.

1. Observe the numbers on the straight line. What characteristics of natural numbers have you discovered?

2.What does the arrow on the right end of the straight line mean?

1, 3, 5, 7, 9, 11, 13, 15...such numbers are odd numbers.

Odd numbers are called odd numbers.

2, 4, 6, 8, 10, 12, 14, 16...such numbers are even numbers.

Even numbers are called even numbers. 0 is also an even number.

In conclusion

1. Numbers like 1, 2, 3, 4, 5, 6, 7...are all natural numbers.

2. There is no object, represented by 0, which is also a natural number.

3. The natural numbers whose ones digit is 1, 3, 5, 7, and 9 are all odd numbers; the natural numbers whose ones digit are 0, 2, 4, 6, and 8 are all even numbers.

give it a try

1. Write all consecutive odd numbers between 1 and 30.

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29.

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30.

Observe two sets of numbers and tell me what you found?

practice

1. Observe the shapes made of small squares below. Without counting, can you tell whether the number of small squares used in each shape is an odd or even number?

2. Fill in the appropriate natural numbers in the brackets.

3. Which of the following numbers are natural numbers?

4. Fill in the following numbers in the appropriate circles.

36 77 103 29 44

88 307 520 6 893

5. (1) Write 5 consecutive odd numbers after 176

(2) Write 5 consecutive even numbers after 205

(3) The difference between two adjacent odd numbers is ( ), and the difference between two adjacent even numbers is ( ).

Problem discussion

1. How many odd numbers and how many even numbers are there from 1 to 100?

2. What is the sum of all odd numbers within 100, and what is the sum of all even numbers?

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For more information about the "Multiples and Factors of Natural Numbers" PPT courseware, please click on the Multiples and Factors ppt Natural Numbers ppt tag.

File Info

Update Time: 2024-10-19

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

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