Sub Lesson Plan

Sub Lesson Plan

Sub: Mrs. Petty.

Grade: 5th grade

Lesson for today: Prime and composite numbers TEKS: Algebraic reasoning. The student applies mathematical process standards to develop concepts of expressions and equations. The student is expected to: (A) identify prime and composite numbers

Objective/ Purpose: We are starting prime and composite numbers today. So, the students will recognize what numbers are prime in their worksheet today. (the worksheet is attached)

How to teach the lesson: (basically read this to them!) • 1 x 13 = 13 1 x 19 = 19 do you notice anything about the number 13 and 19? There is only one way to get to them and it’s by 1! When this happens, we call the numbers prime. A prime number has exactly two factors… 1 and itself! • The other numbers that we can get to more than one way are called composite numbers. o EX: 2 x 3 = 6 1 x 6 = 6 • So, if you can find anything else that goes into a number other than one and itself, then it’s a composite number. • The number 1 is special though because it is neither prime or composite. It only has one factor… just itself! • (now is the time that you will pull out the worksheet and start doing it with them, also tell them you are only finding the prime numbers!) Start off by crossing off number one because they already know it is neither prime or composite.

Sub Lesson Plan • Now you will have them move on to the next number which is 2. Nothing can go into 2 besides 1 therefore it is prime so you will color it. • Now go and cross out all the numbers that go into 2 (all the even numbers) (you should have the whole 2, 4, 6, 8, and 10’s column crossed out) • (let them do the rest of the worksheet from here, then you can go over the rest with them in like 5 minutes) (there is enough numbers left to call on every student and have them give you a number!) • Now go to the next number which is 3. Nothing can go into 3 besides one therefore it’s prime… color it! • Now go and cross out all the numbers that go into 3 ( 9, 15, 21, 27…etc.) • Then go to 7…color it because it only goes into one. Then cross out the numbers that go into 7. ( 49, 77, 91 ) • The rest of the numbers are going to be prime so color those in! • I have attached the student’s worksheet and an example of what it should look like in the end!

Making sure the students understand: Once you go over some of the numbers have the students do the rest of the worksheet on their own. Walk around the classroom to see if any of the students have questions. Give them like 5 minutes then have them tell you the rest of the numbers that they found.

Thanks for subbing Miss. Williams class!

Prime and Composite Numbers • Shade in all the prime numbers (hint: there is 25 of them) • Prime #: a whole number that cannot be made by multiplying other whole numbers. • EX: 5 is a prime number because We cannot multiply other whole numbers like 2, 3 or 4 together to make 5. • EX: 6 can be made by 2×3 so is NOT a prime number, it is a composite number. • 1 is also neither a prime or composite number!

Prime and Composite Numbers • Shade in all the prime numbers (hint: there is 25 of them) • Prime #: a whole number that cannot be made by multiplying other whole numbers. • EX: 5 is a prime number because We cannot multiply other whole numbers like 2, 3 or 4 together to make 5. • EX: 6 can be made by 2×3 so is NOT a prime number, it is a composite number. • 1 is also neither a prime or composite number!