Prime and Composite Lets Review Find the factors
- Slides: 17
Prime and Composite
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 make 2 equal rows…
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 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 tiles in 1 row, and count how many columns.
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 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 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 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 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 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 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 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!
Which numbers are prime? Ⓐ 7 Ⓑ 24 Ⓒ 29 Ⓓ 41 Ⓔ 68 Ⓕ 77
Write a composite number that is greater than 16 and less than 20.
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