"Mathematics in Paper-cutting" PPT Courseware 2

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"Mathematics in Paper-cutting" PPT Courseware 2

There is nothing left after cutting out the square whose side length is a whole centimeter.

Use your brain

If I want to cut a piece of paper 24 cm long and 18 cm wide into a small square with a whole centimeter side, why can the side length of the small square be 1, 2, 3, or 6 cm? Why not 4 and 7 cm?

What is the relationship between 1,2,3,6 and 24 and 18?

group discussion.

They are both factors of 24 and factors of 18

The factors of 24 are:

1, 2, 3, 4, 6, 8, 12, 24

The factors of 18 are:

1, 2, 3, 6, 9, 18

The common factors between 24 and 18 are:

1, 2, 3, 6

The greatest common factor of 24 and 18 is: 6

common factors of special numbers

Find the greatest common factor of each set of numbers. Look carefully. What did you find?

6 and 12 8 and 9

24 and 96 17 and 28

18 and 54 15 and 32

Special case of common factors

A When two numbers are related as multiples, the smaller number is their greatest common factor.

B When two numbers only have a common factor of 1, 1 is their greatest common factor.

Use "□" to mark the factors of 16 and "○" to mark the factors of 24. Find the common factors of 16 and 24.

1. First put “√” in the blank, and then fill in the blank:

(1) The common factors of 8 and 10 are ( ), and the greatest common factor is ( ).

(2) The common factors of 8 and 20 are ( ), and the greatest common factor is ( ).

(3) The common factors of 10 and 20 are ( ), and the greatest common factor is ( ).

2. This is a calendar for this month. Please use triangles to draw which dates are factors of 18, use circles to draw which dates are factors of 30, and then find the common factors and the greatest common factor of 18 and 30.

3. The paper-cutting group cut a total of 40 peonies and 60 carps. They want to divide them among several classes to decorate their classrooms. If each class gets an equal number of peonies and carps, how many classes can they be divided into at most?

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"Mathematics in Paper-cutting" PPT courseware 6:

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"Mathematics in Paper-cutting" PPT courseware 5:

"Mathematics in Paper-cutting" PPT courseware 5 1. Situation introduction From the picture, what mathematical information do you know? What questions can you ask based on this information? What fraction of this paper was used to cut the carp and butterfly? Cutting butterflies uses more paper than cutting carps...

"Mathematics in Paper-cutting" PPT courseware 4:

"Mathematics in Paper-cutting" PPT courseware 4 1. Situation introduction It took 1 meter of wool to make 4 pasted paintings. How many meters of yarn do you use on average for each painting? It took 3 discs to make 4 pasted paintings. On average, how many discs are used in each painting? From the picture, what mathematical information can you know...

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Update Time: 2024-06-27

This template belongs to Mathematics courseware Qingdao Edition Fifth Grade Mathematics Volume 2 industry PPT template

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