"Harvest Season" PPT Courseware 11

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"Harvest Season" PPT Courseware 11

New Year's Day is coming soon, and the art team has to decorate the classroom with 12 square paintings of the same size. If you want to stick a rectangle, how many ways are there?

Group work:

Use the 12 small squares in the school bag to represent the 12 pictures and put them around.

Require:

(1) Take a look at several completely different rectangles that can be arranged;

(2) Think about how to express your pendulum method using multiplication equations.

4×3=12, 4 is a factor of 12, and 3 is also a factor of 12;

12 is a multiple of 3, and 12 is also a multiple of 4.

2×6=12, 2 is a factor of 12, and 6 is also a factor of 12;

12 is a multiple of 2, and 12 is also a multiple of 6.

1×12=12, 1 is a factor of 12, and 12 is also a factor of 12;

12 is a multiple of 1, and 12 is a multiple of 12.

What are the factors of 12?

Factors of 12: 1, 2, 3, 4, 6, 12.

Like this, the method of listing all possibilities one by one in a certain order and finally finding all the answers is called enumeration method in mathematics.

practise:

(1) According to the following calculation formula, talk about which number is a multiple of which number and which number is the factor of which number.

9 × 8＝72 45 ÷ 3＝15

(2) 8 is a multiple and 4 is a factor. ( )

Factors and multiples cannot exist alone.

Did you discover it?

Factors of 12: 1, 2, 3, 4, 6, 12.

Factors of 24: 1,2,3,4,6,8,12,24.

Factors of 16: 1,2,4,8,16.

The number of factors of a number is limited, the smallest factor is 1, and the largest factor is itself.

What are the multiples of 3?

Multiples of 3: 3, 6, 9, 12…

Multiples of 4: 4, 8, 12, 16…

Multiples of 5: 5, 10, 15, 20…

The number of multiples of a number is infinite, the smallest is itself, there is no largest multiple.

game

See who reacts faster

Rules of the game: If your student number meets the following requirements, please stand up and see who has the fastest response.

(1) Whose student number is a factor of 9?

(2) Whose student number is a multiple of 9?

(3) Whose student number is a multiple of 1?

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"Harvest Season" PPT courseware 9:

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Update Time: 2024-09-07

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

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