Children will learn the term variable and then work to "attack" a problem using what they know about the relationship between multiplication and division to solve for an unknown.

Solve for an unknown value x with this fractions calculator. Find the missing fraction variable in the proportion using cross multiplication to calculate the unknown variable x. Solve the proportion between 2 fractions and calculate the...

This site from the Arlington National Cemetery provides full coverage of information on the Tomb. Be sure to click on the Vietnam War hyperlink for the full story of the Vietnam War Unknown. Site also provides excellent pictures.

This WebMath site explains how to enter your equation with one variable and solve for that variable. It explains step-by-step how to solve the equations and gives the final solutions.

Features the history behind the construction of the Tomb of the Unknowns and descriptive details of the tomb itself.

In this task, two brothers track how many games they have each won. Students are asked to make calculations based on the percentage of games won. They set up a rational equation (and a rational inequality) in one variable, and then solve...

Comprehensive summary features detailed facts and information on the Tomb of the Unknown Soldier in Arlington National Cemetery that honors the soldiers who have fallen during service to their country.

An impressive site created by the Society of the Honor Guard gives extensive information on the Tomb and the soldiers who guard it.

Get independent practice determining if the variable value given is a solution for the equation. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.

Given some information about several unknown variables, rewrite and simplify the structure of an expression containing those variables. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...

Rewrite an expression containing two unknown variables by choosing a given equation that is equivalent. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.

Given some information about a real-world context, analyze expressions containing unknown variables that model that context.

Purplemath contains about 40 different lessons on various algebra topics. The lessons are divided into five different sections: preliminary topics, beginning algebra, intermediate algebra, advanced algebra, and word problems. The lessons...

Students are given the opportunity to visualize and interact with concepts they have already learned, specifically algebraic equations and solving for unknown variables. Students construct a balancing seesaw system (LEGO Balance Scale)...

This tutorial models how to solve word problems which state that one unknown variable is greater or less than another. Includes detailed explanations of sample problems and ten practice questions to try.

The lesson plan provided here gives a step-by-step set of instructions for balancing an equation in order to find the value of the unknown variable. After two examples are worked through, 10 practice problems are given, as well as their...

Students can input an equation and have the site solve it for them, complete with steps shown and explanations given along the way. Equations must be simple, first- or second-degree with only one variable. A quick list of rules to follow...

This site from the Arlington National Cemetery provides full coverage of information on the Tomb. Be sure to click on the Vietnam War hyperlink for the full story of the Vietnam War Unknown. Site also provides excellent pictures.

This site from the Arlington National Cemetery provides full coverage of information on the Tomb. Be sure to click on the Vietnam War hyperlink for the full story of the Vietnam War Unknown. Site also provides excellent pictures.

Heres a comprehensive review of the basics of algebra. WyzAnt includes lessons on varied topics, calculators that show step-by-step solutions, and interactive worksheets for practicing and testing your skills. Just choose a topic and use...

In this exercise, students will use inverse operations to solve the equations for the unknown variable, or for the designated variable if there is more than one. Aligns with A-CED.A.4.

Rewrite an expression containing two unknown variables by using a given equation that contains those variables.

Given some information about several unknown variables, evaluate an expression containing those variables.

Based off of the hit television show NUMB3RS, this lesson introduces students to elementary game theory. The lesson is framed in the context of criminal who must get off at one of two subway stops -- will the officer choose the same stop...