Chapter 3

Welcome to our new unit! We wrote our Chapter 2 test last week and we're ready to move on to new concepts in Chapter 3: Number Relationships.

In Chapter 3, Lesson 1, we will be looking at factors. Factors are the numbers that a number can be divided by. On Friday, we played a game that introduced this concept, but you have worked with arrays in the past and that's basically the same thing, as you will discover in this lesson. For this video, you will want to grab a piece of paper, a pencil, and a calculator.

Welcome to Chapter 3, Lesson 2! In this lesson, we are going to look to the stars, actually, more specifically, we're going to look to the comets. The Kojima comet orbits the sun every seven years. That means that we can see it from Earth (usually) every seven years as well. We are going to use multiples to find out which years we're likely to see the comet Kojima. You will need a pencil and piece of paper to complete this lesson.

For this lesson, we will be learning about prime and composite numbers. You have already been exploring prime numbers in the last two lessons because you noticed that certain numbers can only be divided by 1 and themselves. For a special bonus, I encourage you to print off this 100 Chart PDF. You can use it for your lesson today AND if you bring it to me tomorrow during math class, I will give you a prize!

Welcome to Chapter 3, Lesson 4. In this lesson we will explore factoring numbers in more depth. You will need a piece of paper and pencil for the end of this lesson. You may want to also get a calculator handy.

There are some important terms that you need to remind yourself about here:

• Factor: a number that you use to divide another number by.
• Composite Number: a number that can be divided by another number (other than 1 and itself).
• Prime Number: a number that can ONLY be divided by 1 and itself.

After Chapter 3, Lesson 5, we are going to have another exploratory class. I'm going to explain the problem so you can start thinking about the lesson, but I don't really need you to do anything to solve it yet - just give it some thought. A reminder that prime numbers are numbers that can only be divided by 1 and themselves, composite numbers are numbers that can be factored by more than 1 and themselves, and factors are numbers that you can divide other numbers by.

I should note that I made a mistake in this video at 3:20 - 2x2x2 does NOT equal 6, it should be 8!

In this lesson, Chapter 3, Lesson 6, you will use an "organized list" to solve a problem. Basically, I'm going to give you a set of clues and we'll see if we can find an answer. Think of it as a puzzle! You won't need anything for this lesson, just pay close attention to the method that I use because you'll have to use it tomorrow for your textbook questions on page 88.

For Chapter 3, Lesson 7 we will be exploring integers. Integers are a family of numbers that consist of negative and positive numbers (-, +). There are no other types of numbers in the integer family (such as fractions).

In Chapter 3, Lesson 8 we will again explore integers (negative and positive numbers). We will look at a list of temperatures and place them in order of coldest to warmest. It is always useful to think of a number line when doing this.

Hello, and welcome to the last lesson of Chapter 3, Lesson 9!

Today's lesson is about Order of Operations. This is a technique for making calculations when you have a number problem with many different operations (addition, subtraction, division, multiplication). You may not have thought about this before, but it really matters which order you do your operations in. Let's have a look!