Lesson 10
Getting Started (Introduction to Matrices, continued)
What is a matrix? A matrix is a rectangular arrangement of values inside brackets. The “rectangular arrangement” is made up of rows and columns. We use the number of rows by number of columns to name a matrix. For example, a 3x4 matrix has 3 rows and 4 columns.
Each individual value inside a matrix is called an element of the matrix. If we have a matrix named A, A[2,3] means the individual value located at the cross-section of row 2 and column 3.
Very Important
When we name a matrix the number of rows ALWAYS comes before the number of columns. Just think RC.

Before beginning Part 1...
1. Download the Virtual ClassPad file (vcp file)
- Click Lesson_10.vcp
- Choose the Save or Save As… option
- Open the Save in dropdown box (near top)
- Brows to your My Documents folder and select it
- Select the CASIO folder and then the ClassPad Manager folder
- Click Save
- Click Open Folder
- Double click on Lesson_10.vcp to open it
2. Alternative way to open a Virtual ClassPad File
- Right click on your ClassPad (a "context menu" will appear)
- Select File and then Open...
- Browse to your Lesson_10.vcp file (It should be in My Documents/CASIO/ClassPad Manager folder)
- Select Lesson_10.vcp
- Click Open
Part I
In this part, we will practice creating matrices, adding matrices and multiplying a matrix by a number (called a scalar).
1. Inputting a 2x3 Matrix

2. Inputting a 2x3 Matrix (Another Way) & Scalar Matrices

3. Adding Two Matrices

Part I
Practice Exercises
Before beginning the practice exercises, open a word document, type in the following information and then save it as Lesson10 in your CASIO folder within My Documents:
- Date: (enter today's date)
- To: (put your instructor's name here)
- From: (put your name here)
- Re: Lesson 10
- Please open the eActivity application.
- Open the eActivity named L10_PartI_a in the Lesson 10 folder.
- Find the sum of the two given matrices inside the Verify window.
- Once you find the sum, get a screen capture. Paste it into your Lesson 10 document (under a title of PART I).
- Save your work as an eActivity named L10_PartI_a_your initials here.
- Open the eActivity named L10_PartI_b in the Lesson 10 folder.
- In this exercise, you are asked to rewrite a single matrix as the sum of two matrices. Before beginning, open the Verify strip that contains an example so that you can see what you need to do.
- When you have your matrix rewritten (note that there can be many different answers), get a screen capture. Add two blank spaces following the first screen capture and then paste this one.
- Save your work as an eActivity named L10_PartI_b_your initials here.
- Open the eActivity named L10_PartI_c in the Lesson 10 folder.
- In this exercise, you will rewrite a single matrix as a scalar multiple times a matrix. Before beginning your exercise, open the Verify strip that contains an example.
- When you have your matrix rewritten, get a screen capture. Add two blank spaces following the last screen capture and then paste this one.
- Save your work as an eActivity named L10_PartI_c_your initials here.