Prime Composite Numbers Review 5 th Grade Math

Prime & Composite Numbers Review 5 th Grade Math CM 2 FK 1

Learning Objective I will use models to identify prime numbers and composite numbers

Let’s Review Listen to the following song and try to define Prime and Composite Numbers Prime and Composite Song

Vocabulary Review Prime Number – A whole number with exactly two factors, 1 and itself Composite Number – A whole number that has more than two factors

Let’s look at the number “ 3”… how many rectangular arrangements can you make with the number “ 3” using your chips?

Let’s look at the number “ 3”… how many rectangular arrangements can you make with the number “ 3” using your chips? 1 x 3 3 X 1

Try one more… Let’s look at the number “ 4”… how many rectangular arrangements can you make with the number “ 4” using your chips?

4 4 X 1 1 X 4 2 x 2

Try it on your own… How many different arrangements can you make with the number “ 2” using your chips

2 1 X 2 2 X 1

Try it on your own… How many different arrangements can you make with the number “ 5” using your chips

5 1 X 5 5 X 1

Try it on your own… How many different arrangements can you make with the number “ 7” using your chips

7 1 X 7 7 X 1

Try it on your own… How many different arrangements can you make with the number “ 12” using your chips

12 1 X 12 2 X 6 3 X 4

Try it on your own… How many different arrangements can you make with the number “ 17” using your chips

17 1 X 17

Try it on your own… How many different arrangements can you make with the number “ 20” using your chips

20 1 X 20 2 X 10 4 X 5

On your own Complete the table with the following numbers… 6 10 14 18 8 11 15 19 9 13 16 21

Review Answers Number Factors Prime or Composite? COMPOSITE 6 1 X 6 2 X 3 1, 2, 3, 6 COMPOSITE 8 1 X 8 2 X 4 1, 2, 4, 8 COMPOSITE 9 1 X 9 3 X 3 1, 3, 9

Review Answers Number Factors Prime or Composite? COMPOSITE 10 1 X 10 2 X 5 1, 2, 5, 10 1 X 11 PRIME 11 1, 11 1 X 13 13 1, 13 PRIME

Review Answers Number Factors Prime or Composite? COMPOSITE 14 1 X 14 2 X 7 1, 2, 7, 14 1 X 15 3 X 5 COMPOSITE 15 16 1, 3, 5, 15 1 X 16 2 X 8 4 X 4 1, 2, 4, 8, 16 COMPOSITE

Review Answers Number Factors Prime or Composite? COMPOSITE 18 1 X 18 2 X 9 3 X 6 1 X 19 PRIME 1, 3, 5, 15 1 X 21 3 X 7 COMPOSITE 19 21 1, 3, 7, 21

Review What was our learning objective? Define Prime Number Define Composite Number How do you determine if a number is prime or composite?