Find the inverse of three $2 \times 2$ invertible matrices.

Multiplication of $2 \times 2$ matrices.

Exercises in multiplying matrices. 

Elementary Exercises in multiplying matrices. 

Find the determinant of three $2 \times 2$ invertible matrices.

Elementary examples of multiplication and powers of complex numbers. Four parts.

Inverse and division of complex numbers.  Four parts.

Multiplication of complex numbers. Four parts.

Multiply two numbers in standard form, then divide two numbers in standard form.

Multiplication and division of upper and lower bounds.

Find the determinant and inverse of three $2 \times 2$ invertible matrices.

Multiplication of $2 \times 2$ matrices.

Very elementary matrix multiplication. 

Elementary examples of multiplication and addition of complex numbers. Four parts.

Composite multiplication and division of complex numbers. Two parts.

Direct calculation of low positive and negative powers of complex numbers. Calculations involving a complex conjugate. Powers of $i$. Four parts.

Finding the modulus of four complex numbers; includes finding the modulus of a product, a power and a quotient.

Find the squares, and cubes, of some numbers.

Finally, find a square number between two given limits.

Several problems involving the multiplication of fractions, with increasingly difficult examples, including a mixed fraction and a squared fraction. The final part is a word problem. 

Given an equation with an unknown, determine if the unknown is positive or negative.

First part is the product of two numbers; second part is the product of three.

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.

Find the determinant and inverse of three $2 \times 2$ invertible matrices.

Putting a pair of linear equations into matrix notation and then solving by finding the inverse of the coefficient matrix. 

Exercises in multiplying matrices. 

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.

Putting a pair of linear equations into matrix notation and then solving by finding the inverse of the coefficient matrix. 

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.