Math Is Fun
Math Is Fun: Balance When Adding and Subtracting
An interactive scale shows you how to deal with numbers and variables when solving simple algebraic equations.
University of Texas
Inside Mathematics: Boxes [Pdf]
This task challenges students to demonstrate an understand of the concept of equality using scales and balance beams.
Math Slice
Math Slice: Heavy Slice Special Test
A concise test for assessing number sense using weights and scales. Assessment is scored online offering students immediate feedback. Can be used for a quick assessment.