Explanation

A matrix is a rectangular arrangement of numbers organized into rows and columns.

Example:
[ 1 2 ]
[ 3 4 ]

This matrix has:

• 2 rows

• 2 columns
  So it is a 2 × 2 matrix

Important vocabulary:

• Entry: a number in the matrix

• Dimensions: rows × columns

Matrices are used to:

• Store data

• Perform calculations efficiently

• Represent transformations and systems

Quiz (5 Questions)

1. What is a matrix?

2. How many rows are in a 3 × 2 matrix?

3. How many columns are in a 3 × 2 matrix?

4. What is an entry?

5. Are matrices always square?

Answer Key

1. A rectangular array of numbers

2. 3

3. 2

4. A number inside the matrix

5. No