Prime and Composite Lets Review Find the factors

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Prime and Composite

Prime and Composite

Let’s Review Find the factors of 9. 1 x 9=9 First I put the

Let’s Review Find the factors of 9. 1 x 9=9 First I put the tiles in 1 row, and count how many columns.

Let’s Review Find the factors of 9. 1 x 9=9 Then I try to

Let’s Review Find the factors of 9. 1 x 9=9 Then I try to make 2 equal rows…

Let’s Review Find the factors of 9. 1 x 9=9 3 x 3=9 I

Let’s Review Find the factors of 9. 1 x 9=9 3 x 3=9 I can’t make 2 equal rows!!! So I will try to make 3 equal rows.

Let’s Review Find the factors of 9. Write the factors in order from least

Let’s Review Find the factors of 9. Write the factors in order from least to greatest. 1 x 9=9 3 x 3=9 Factors of 9: 1, 3, 9 If a number has more than 2 factors it is called COMPOSITE!

Find the factors of 11 1 x 11 = 9 First I put the

Find the factors of 11 1 x 11 = 9 First I put the tiles in 1 row, and count how many columns.

Find the factors of 11 1 x 11 = 9 I can’t make 2

Find the factors of 11 1 x 11 = 9 I can’t make 2 equal Then I rows!!! try to make 2 So I will tryrows… to make 3 equal rows.

Find the factors of 11 1 x 11 = 9 I can’t make 23

Find the factors of 11 1 x 11 = 9 I can’t make 23 equal First I put the tiles in Then Irows!!! try to make 2 1 row, and count how So I will tryrows… to make 34 equal many columns. equal rows.

Find the factors of 11 1 x 11 = 9 can’t make 234 equal

Find the factors of 11 1 x 11 = 9 can’t make 234 equal II can’t First I put the tiles in rows!!! Then Irows!!! try to make 2 1 row, and count how So II will tryrows… to make 345 So try to equal many columns. equal rows. equal

Find the factors of 11 1 x 11 = 9 can’t make 2534 equal

Find the factors of 11 1 x 11 = 9 can’t make 2534 equal II can’t First I put the tiles in rows!!! Then Irows!!! try to make 2 1 row, and count how So II will tryrows… to make 3645 So try to equal many columns. equal rows. equal

Find the factors of 11 If a number ONLY has 2 factors it is

Find the factors of 11 If a number ONLY has 2 factors it is called PRIME! 1 x 11 = 9 I can’t make 6 equal can’trows!!! make 2534 equal II can’t make First I put the tiles And I have thanin 22 rows!!! Then Irows!!! tryless to make 1 row, and count how complete columns… So II will try to makeso So try to 3645 equal rows… many columns. there are no more equal rows. combinations!

How do I know if a number is prime or composite? A number is

How do I know if a number is prime or composite? A number is composite if it has more than 2 factors, therefore I know it is composite if I find at least 2 factor pairs. Prime means that a number only has 1 and itself as a factor.

Use divisibility rules to help determine if a number is prime or composite 63

Use divisibility rules to help determine if a number is prime or composite 63 88 7 Prime If I add the It is a even digits The Ionly get a number. . So 2 factors multiple of of 7 are 3, is a factor, 1 and so 37… is so a it therefore it is factor… is PRIME. it is composite. Composite

Use patterns to help determine if a number is prime or composite 53 34

Use patterns to help determine if a number is prime or composite 53 34 Prime Composite What other patterns do you see? If. Except a 3 is on forthe 2 ones place, and 5. Alland it is not a other primes multiple of 3, have a 1, 3, 7, then is or 9 initthe PRIME ones place.

Solve Try it Out!

Solve Try it Out!

Which numbers are prime? Ⓐ 7 Ⓑ 24 Ⓒ 29 Ⓓ 41 Ⓔ 68

Which numbers are prime? Ⓐ 7 Ⓑ 24 Ⓒ 29 Ⓓ 41 Ⓔ 68 Ⓕ 77

Write a composite number that is greater than 16 and less than 20.

Write a composite number that is greater than 16 and less than 20.