This site contains great information on adding and subtracting complex numbers. Several examples are given, along with a brief definition. Includes link to a graphing calculator tutorial.

Use this Least Common Denominator Calculator to find the lowest common denominator (LCD) of fractions, integers and mixed numbers. Finding the LCD is important because fractions need to have the same denominator when you are doing...

Add and subtract proper and improper fractions with this calculator and see the work involved in the solution.

Sort the mail into the correct post boxes by working out simple addition, subtraction and division calculations as well as multiples. A resource which is great for use on interactive whiteboards too.

This website contains tutorials that cover the methods used to solve linear equations, substitution, elimination (adding & subtracting), and graphing. The practice pages allow students to practice the skills they have learned. On the...

In Spanish. This site contains many games for practicing mental numerical calculation of basic operations.

Do you know how long it takes your heart to beat 100 times? Test your estimation and number sense skills with this problem-solving challenge. A one-page activity taken from the NCTM Math Challenges for Families Collection. Hints and...

In this lesson, students use a graph to choreograph a dance figure. Media resources and teacher materials are included.

This tutorial on signed numbers features lesson plans, practice pages, examples, application problems, and interactive work. Teacher resources include overhead manipulatives, card games, a Bingo game, and graphing calculator downloads.

Generate a quiz of money word problems in a real-life context. Students will use addition, subtraction, multiplication, and division to solve the problem. An assessment summary is given at the end of the quiz, and students may review...

Do movie theaters make lots of money? You can find out when you try this math challenge that explores profit and loss in the theater industry. Discover why understanding problem solving, percent, and basic calculations are essential in...

Interactive lessons are provided for many topics in algebra, including: laws of algebra, powers, roots and radicals, algebraic expressions, equations, and more. Use the links to navigate the tutorial and learn more focused concepts. The...

Is you Beanie Baby business booming or busted! Figure out if you made a profit or lost money in this mathematic computation activity. A one page activity from the NCTM Math Challenges for Families collection that focuses on adding and...

This lesson will give students practice with adding and subtracting money using a calculator. It will provide them an opportunity to determine savings using a store coupon, and determine the change they should recieve when making...

Cyberchase video in which a man must adjust his dinner budget after his cousin unexpectedly decides to join him on his date. [3:26]

In this Cyberchase video segment, Matt uses subtraction to help Digit figure out how much time he has left in a cooking contest with Hacker.