Factors, Prime and Composite Numbers

What is a factor?

• "Factors" are the numbers you multiply to get another number. For instance, factors of 15 are 3 and 5, because 3×5 = 15

• A factor is a number written in word form

• "Factors" tell you facts about all the numbers in the world

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CCSS.4.OA.B.4

Prime numbers have:

• Exactly 2 factors

• 2 pairs of factors

• More than 2 factors

• 1 factor

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CCSS.4.OA.B.4

is 5 prime or composite?

• prime

• composite

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CCSS.4.OA.B.4

Which number is a factor of 10?

• 3

• 5

• 4

• 8

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CCSS.4.OA.B.4

The number 11 is​ (a)   because it has ​ (b)  

• prime

• composite

• exactly 2 factors

• more than 2 factors

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CCSS.4.OA.B.4

Are each of these numbers prime or composite?

• prime

• 12

• composite

• 3

• composite

• 10

• composite

• 7

• prime

• 15

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CCSS.4.OA.B.4

The number 21 is ​ (a)   because it has ​ (b)  

• composite

• prime

• more than 1 factor pair

• exactly 1 factor pair

Tags

CCSS.4.OA.B.4

The number 17 is ​ (a)   because it has ​ (b)  

• prime

• composite

• exactly 1 factor pair

• more than 1 factor pair

Tags

CCSS.4.OA.B.4

The number 25 is ​ (a)   because it has ​ (b)  

• composite

• prime

• more than 2 factors

• exactly 2 factors

Tags

CCSS.4.OA.B.4

1 is neither prime nor composite

• True

• False

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CCSS.4.OA.B.4