This online manipulative features a virtual balance scale. It offers students an experimental way to learn about solving linear equations involving negative or positive numbers. The applet presents an equation for the student to illustrate by balancing the scale using blue blocks for positive units and variables and red balloons for negative units and variables. The student then works with the arithmetic operations to solve the equation. A record of the steps taken by the student is shown on the screen and on the scale. The applet reinforces the idea that what is done to one side of an equation must be done to the other side to maintain balance. Instructions for using the applet, background information about solving equations, and teaching suggestions are included.


  • Mathematics > General

Education Levels:

  • Grade 1
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Informal Education,Middle School,NSDL,Grade 6,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-016,High School,Mathematics,oai:nsdl.org:2200/20120614151517190T



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Update Standards?

CCSS.Math.Content.6.EE.A.2a: Common Core State Standards for Mathematics

Write expressions that record operations with numbers and with letters standing for numbers.

CCSS.Math.Content.8.EE.C.7a: Common Core State Standards for Mathematics

Give examples of linear equations in one variable with one solution, infinitely many solutions, or no solutions. Show which of these possibilities is the case by successively transforming the given equation into simpler forms, until an equivalent equation of the form x = a, a = a, or a = b results (where a and b are different numbers).

CCSS.Math.Content.8.EE.C.7b: Common Core State Standards for Mathematics

Solve linear equations with rational number coefficients, including equations whose solutions require expanding expressions using the distributive property and collecting like terms.

CCSS.Math.Content.HSA-CED.A.1: Common Core State Standards for Mathematics

Create equations and inequalities in one variable and use them to solve problems. Include equations arising from linear and quadratic functions, and simple rational and exponential functions.

CCSS.Math.Content.HSA-REI.A.1: Common Core State Standards for Mathematics

Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.

CCSS.Math.Content.HSA-REI.A.2: Common Core State Standards for Mathematics

Solve simple rational and radical equations in one variable, and give examples showing how extraneous solutions may arise.

CCSS.Math.Content.HSA-REI.B.3: Common Core State Standards for Mathematics

Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.
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