Unit 2: Operations

Multiplication, Division, and Algebraic Thinking

Academic Vocabulary Glossary

Lesson 6: Understanding Multiplication as a Comparison

Meaning of multiplication:

Here is an example of an equation written as a word problem and modeled as a bar model.

How to study:

Study the unit vocabulary on Quizlet.
Remember, try to think of "times" as the amount of groups.
Watch this video. Pause and play so you work while Sal works.

Important Note:

You can use a bar model to help you calculate multiplication problems. It is best to memorize your multiplication tables so can solve harder problems faster.

There are 4 different ways to state a comparison:

21 is 3 times as much as 7 (21 = 3 x 7)
21 is 7 times as much as 3 (21 = 7 x 3)
3 times as much as 7 is 21 (3 x 7 = 21)
7 times as much as 3 is 21 (7 x 3 = 21)

Lesson 7: Multiplication and Division in Word Problems

Your goal is to move from bar models to equations. This is where we start thinking algebraically.

We use symbols to represent the unknown part of the problem.
5 X 8 = ? <--- The question mark represents an unknown answer. We call it a variable.
If you don't know your times tables, you can use repeated addition to find out the answer.

How might you write this problem as an algebraic expression?

underline, circle, and box key words and numbers
turn it into an equation
use a variable for the unknown

Lesson 8: Multiples and Factors

Now is a good time to review vocabulary terms using Quizlet.
Watch the video to the right.
Click here for a quick review and click take quiz.

Watch this video to review factor and multiple used correctly in a conversation. Press pause and play to guess the answers before Sal tells you.

Lesson 9: Numbers and Shape Patterns

Review number and shape patterns by clicking the link.
Remember, we can use multiples to help us predict future pattern placement, like the 62 veggie in the garden.

Lesson 10: Model and Solve Multistep Problems

Review strategies for breaking down a word problem.
Read over the problem to the right.
Let's watch the following video and answering questions on our whiteboards. It's estimated to take 25 minutes.

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