"Mathematics in Paper-cutting" PPT Courseware 3

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"Mathematics in Paper-cutting" PPT Courseware 3

1. Situation introduction

The paper-cut work is 3 decimeters long

2 decimeters wide

Arranged into a square display board

How many decimeters can the side length of a square display panel be?

How many decimeters can be the shortest?

What mathematical information do you know from the picture?

What questions can you ask based on this information?

2. Cooperation and exploration

How many decimeters can the side length of a square display panel be? How many decimeters can be the shortest?

Use a small rectangular piece of paper 3 cm long and 2 cm wide to replace the word "spring" and display it.

Using 6 small squares, you can create a large square with a side length of 6 cm.

Using 24 small squares, you can create a large square with a side length of 12 cm.

Can you find the common multiple and least common multiple of 12 and 18?

First write down the multiples of 18, and then find the multiples of 12.

Multiples of 18: 18, 36, 54, 72…

Common multiples of 12 and 18: 36, 72...

The lowest common multiple of 12 and 18: 36.

You can also use short division to find the least common multiple of 12 and 18.

The least common multiple of 12 and 18 is: ×××=36

Think about it, what are the similarities and differences when using short division to find the greatest common factor and least common multiple of two numbers?

The same point: they are all divided by common factors in order, until the common factor is only 1.

The difference: to find the greatest common factor is to multiply the divisors together; to find the least common multiple is to multiply the divisors and the quotient.

3. Independent practice

1. Use △ to circle the multiples of 4, and use ○ to circle the multiples of 6.

The multiples of 4 and 6 in the table are 12, 24, 36, and 48.

The least common multiple of 4 and 6 is 12.

2. Xiaoqiang walks 2 piles at each step, and dad walks 3 piles at each step. Can you paint red on the stake that both father and son stepped on?

3. How many students may there be in this class?

Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48…

Multiples of 8: 8, 16, 24, 32, 40, 48, 54…

Common multiples of 6 and 8: 24, 48,…

Answer: There may be 24 students in this class, or there may be 48 students.

Keywords: Mathematics teaching courseware in paper-cutting, Qingdao edition fifth grade mathematics volume 2 PPT courseware download, fifth grade mathematics slide courseware download, mathematics in paper-cutting PPT courseware download, .PPT format;

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Update Time: 2024-09-29

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