# 3.1 Introducing Multiplication

## Unit Goals

- Students represent and solve multiplication problems through the context of picture and bar graphs that represent categorical data.

### Section A Goals

- Interpret scaled picture and bar graphs.
- Represent data using scaled picture and bar graphs.
- Solve one- and two-step story problems using addition and subtraction.

### Section B Goals

- Represent and solve multiplication problems involving equal groups.
- Understand multiplication in terms of equal groups.

### Section C Goals

- Represent and solve multiplication problems involving arrays.

### Glossary Entries

**array**An arrangement of objects in rows and columns. Each column must contain the same number of objects as the other columns, and each row must have the same number of objects as the other rows.

**bar graph**A way to show how many in each group or category using the length of rectangles.**equation**A statement that includes an equal sign (=). It tells us that what is on one side of the sign is equal to what is on the other side.

**expression**An expression has at least 2 numbers and at least one math operation (such as addition, subtraction, multiplication and division).

**factor**When we multiply two whole numbers to get a product, each of those numbers is a factor of the product.**key**The part of a picture graph that tells what each picture represents.**multiplication**The operation that tells you the total number of objects when you have a certain number of equal groups.**picture graph**A way to show how many in each group or category using pictures of the objects or symbols.**product**The result of multiplying some numbers.**scaled bar graph**A bar graph marked in multiples of some number other than 1.**scaled picture graph**A picture graph where each picture represents an amount other than 1.