Unit 1 Matrices Formative Assessment

Identify the dimensions of the following matrix.

• 2 X 3

• 3 X 2

• 3 X 4

• 4 X 3

Answer explanation

Dimensions of matrices, or orders, give rows by columns

 $a_{23}\ =\$  

• 14

• 1

• 4

• 2

A matrix contains 48 elements. Which of the following cannot equal the number of rows of the matrix?

• 18

• 16

• 8

• 24

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

• The number of columns in the 1st must equal the number of rows in the 2nd.

Find the product, AB.

• 
• 
• 
• 

• 
• 
• 
• 

Solve for X.

• 
• 
• 
• 

Solve for X

• 
• 
• 
• 

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

Tags

CCSS.HSN.VM.C.8

These matrices are being multiplied. Determine the dimension/size of the new matrix. 

• Can't multiply them
• 4  x  2
• 3  x  3
• 4  x  3