Simplifying Algebraic Expressions: Addition & Subtraction
By Allen Reed, Douglas Jensen
Learners read definitions of the terminology associated with algebraic operations and then follow steps to simplify algebraic expressions.
Solving Systems of Linear Equations Using the Substitution Method
In a series of practice problems, learners use the substitution method to solve systems of linear equations, also called "simultaneous linear equations."
Solving Systems of Linear Equations Using the Addition or Subtraction Method (Screencast)
In a series of practice problems, learners use the addition or subtraction method to solve systems of linear equations, also called "simultaneous linear equations."
Ratios and Proportions
In this interactive object, learners simplify ratios and solve problems using proportions. All terms are defined.
Solving Trade Discount Problems (Screencast)
By David Nunenkamp
In this screencast, learners follow a step-by-step process to solve trade discount problems.
International Time Zones (Screencast)
By Virginia Kirsch
In this screencast, you will learn about the 24 time zones.
Standard-Position Angles and Reference Angles
By Kevin Ritzman
The learner will recognize standard-position angles and find the reference angle for any standard-position angle.
Numerical Curiosities: Part 4
By Jeganathan Sriskandarajah
In this fourth part in a series, learners follow the steps of the “mathemagician” to examine three numerical curiosities: Be a Psychic by Predicting Birthdays, Predict a Card with Mind Reading, and Predict the Three Die Values Your Opponent Has Rolled. Learners will also study palindromic numbers and look at two alphametric puzzles.
Numerical Curiosities: Part 2
In part 2 of this series, learners follow the steps of the “mathemagician” to examine these numerical curiosities: The 189 Challenge; An Armstrong Number: What’s Special About 153? Is 495 Different or Indifferent? Is 6174 Different or Indifferent? It is always 618, and Beginning and Ending the Same.
Numerical Curiosities: Part 3
In this interactive object, part 3 in a series, learners follow the steps of the “mathemagician” to examine four numerical curiosities: What’s Special About 1089, Perfect Squares: 1089 and 9801, The Mathematical Significance of 1776, and The Calculator Number Game. The learner will also study six number patterns and look at one remarkable table. Immediate feedback is provided.
The Square
In this animated activity, learners read about the properties of a square and its components. They then work practice problems to find the perimeter and area of squares.
The Rectangle
In this animated activity, learners read about the properties of a rectangle and its components. They then work practice problems to find the perimeter and area of rectangles.
The Parallelogram
In this animated activity, learners read the definition of a parallelogram and then find the perimeter and area of parallelograms in practice problems.
The Mathematics of Buying: Putting It All Together
By Mary Lee Rudnick-Kaun
Learners tackle this interactive learning object after studying the mathematics of buying. This activity ties together the ideas of net cost, list price, trade discounts, cash discounts, net cost equivalent, and single discount equivalent, as well as the concepts of part, base, and rate.
The Sphere
Learners study the properties of a sphere and use geometric formulas to find volume and surface area.
The Cube
Learners study the properties of a cube and use geometric formulas to find volume and surface area.
The Triangle
Learners examine the properties of a triangle and work practice problems to find a triangle's perimeter and area.
The Trapezoid
In this interactive object, learners study the properties of a trapezoid and use a geometric formula to find its perimeter and area.
The Regular Square Pyramid
Learners study the properties of a regular square pyramid and use geometric formulas to find volume and surface area.
Operations with Zero
Learners review the basic math operations involving zero, emphasizing that division by zero is undefined. Examples are given.
The Right Circular Cylinder
Learners study the properties of a right circular cylinder and use geometric formulas to find volume and surface area.
The Rectangular Solid
Learners study the properties of a rectangular solid and use geometric formulas to find volume and surface area.
The Right Circular Cone
Learners study the properties of a right circular cone and use geometric formulas to find volume and surface area.
Simplifying Algebraic Expressions: Multiplication
Learners read definitions of the terminology associated with algebraic operations and then follow steps to use the fundamental laws of multiplication to simplify algebraic expressions.
The Circle
By Douglas Jensen
In this animated and interactive object, learners examine the definitions and formulas for radius, diameter, circumference, and area. Students also solve practice problems involving the circumference and area of a circle.