"Characteristics of Multiples of 2 and 3" Factors and Multiples PPT Courseware

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Western Normal University Edition Fifth Grade Mathematics Volume 1	pptx	6 MB

"Characteristics of Multiples of 2 and 3" Factors and Multiples PPT Courseware

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Upload Time: 2024-10-01

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"Characteristics of Multiples of 2 and 3" Factors and Multiples PPT Courseware

These numbers are all multiples of 2. Do you notice any characteristics of multiples of 2?

Numbers with 0, 2, and ________ in the units digit are all multiples of 2.

Among natural numbers, numbers that are multiples of 2 are called even numbers (0 is also an even number), and numbers that are not multiples of 2 are called odd numbers.

Do it

Which of the following numbers are multiples of 2, and which numbers are multiples of 5? Which are multiples of 2 and 5?

194 120 105 200 245

( ) ( ) ( ) ( ) ( )

think about it

Thinking: Is the sum of an odd number and an even number an odd number or an even number? Is the sum of odd numbers and odd numbers odd or even, and what about the sum of even numbers and even numbers?

Characteristics of multiples of 3:

If the sum of the digits in a number is a multiple of 3, the number must be a multiple of 3.

Judgment (mark √ if correct, × if incorrect)

(1) If the units digit is 3, 6, or 9, it must be a multiple of 3. ( )

(2) A number that is a multiple of 3 must be a multiple of 6. ( )

(3) Multiples of 3 must be odd numbers. ( )

(4) A number that is a multiple of 2 and 3 must be a multiple of 6. (√)

See who can use the fastest method to determine whether the four-digit number 5169 is a multiple of 3.

5169, 5+1+6+9=21

So 5169 is a multiple of 3.

5169, 5+1=6

So 5169 is a multiple of 3.

Summary of rules

Like 369, 3, 6, and 9 are all multiples of 3, so 369 is a multiple of 3.

Like 469, 6 and 9 are multiples of 3, but 4 is not a multiple of 3, so 469 is not a multiple of 3.

Like 24398, 3 and 9 are both multiples of 3. 2+4+8=14 is not a multiple of 3, so 24398 is not a multiple of 3.

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For more information about the "Characteristics of Factors and Multiples of 23" PPT courseware, please click the Characteristics of Factors and Multiples PPT23 PPT tab.

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"Characteristics of Multiples of 2 and 3" Factors and Multiples PPT Courseware