"Finding the Greatest Common Factor" The meaning of fractions PPT download

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"Finding the Greatest Common Factor" The meaning of fractions PPT download

Part One: Learning Objectives

1. Explore ways to find the common factors of two numbers, and use the enumeration method to find the common factors and the greatest common factor of two numbers.

2. Experience the process of finding the common factors of two numbers, and understand the meaning of common factors and the greatest common factor.

focus

Can use enumeration method to find the common factors and greatest common factor of two numbers.

difficulty

Understand the meaning of common factors and greatest common factor.

Find the greatest common factor PPT, part 2: interpretation of examples

Find all the factors of 12 and 18 and share with your partner how you found them.

Method 1: Use multiplication formulas.

1×12=12, 2×6=12, 3×4=12

So the factors of 12 are 1, 2, 3, 4, 6, and 12.

1×18=18, 2×9=18, 3×6=18

So the factors of 18 are 1, 2, 3, 6, 9, and 18.

Method 2: Use the division formula.

12÷1=12, 12÷2=6, 12÷3=4

So the factors of 12 are 1, 2, 3, 4, 6, and 12.

18÷1=18, 18÷2=9, 18÷3=6

So the factors of 18 are 1, 2, 3, 6, 9, and 18.

How many factors do 12 and 18 have in common? Share your approach with peers.

Method 1: List all the factors of 12 and 18 and find the same numbers.

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

Factors of 18: 1, 2, 3, 6, 9, 18

Method 2: Find out which of the factors of 12 are factors of 18.

The same factors of 12 and 18 are 1, 2, 3, and 6.

Typical examples

[Example 1] Please find the greatest common factor of each group of numbers below.

4 and 6 | 3 and 13

[Example 2] Cut the following three ribbons into the same short ribbons without any leftovers. How many centimeters is the longest length of each short ribbon?

The greatest common factor of 30, 40, and 60 is 10

Answer: The longest length of each short ribbon is 10 cm.

Find the greatest common factor PPT, the third part: summary

How to find the greatest common factor of two numbers

First find out all the factors of each of the two numbers, and then find out the common factors of the two numbers. The largest one is the greatest common factor of the two numbers.

Find the greatest common factor PPT, part 4: quiz in class

1. I am a little judge.

(1) The number of common factors of two numbers is limited, and there is only one greatest common factor of two numbers. ()

(2) 1 is the common factor of all non-zero natural numbers. ()

(3) Because a÷b=4, 4 is the greatest common factor of a and b. ()

(4) The greatest common divisor of any two adjacent non-zero natural numbers is 1. ()

2. Find the greatest common factor of the numerator and denominator of the following fractions.

Find the greatest common factor PPT, part 5: homework

1. Select from the after-class exercises;

2. Complete the exercises in this lesson in the exercise book.

Keywords: Beijing Normal University edition fifth grade mathematics PPT courseware free download, find the greatest common factor PPT download, the meaning of fractions PPT download, .PPT format;

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Update Time: 2024-11-21

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