Area BuilderAn interactive workspace in which to make shapes using square tiles with given areas and perimeters. 
Attribution PhET Interactive Simulations, University of Colorado Boulder, https://phet.colorado.edu.


Transum.orgThis web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available. Please contact me if you have any suggestions or questions. 
More Activities: 

Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 2 April 'Starter of the Day' page by Mrs Wilshaw, Dunsten Collage,Essex: "This website was brilliant. My class and I really enjoy doing the activites." Comment recorded on the 3 October 'Starter of the Day' page by Mrs Johnstone, 7Je: "I think this is a brilliant website as all the students enjoy doing the puzzles and it is a brilliant way to start a lesson." 


Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 

Go MathsLearning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths main page links to more activities designed for students in upper Secondary/High school. TeachersIf you found this activity useful don't forget to record it in your scheme of work or learning management system. The short URL, ready to be copied and pasted, is as follows: 

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments. 
This activity can be found online at:
www.transum.org/Maths/Activity/PhET/Area_Builder.asp?
This activity was created and is distributed by PhET. Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education research and engage students through an intuitive, gamelike environment where students learn through exploration and discovery.
PhET licenses this sctivity under a Creative Commons Attribution 4.0 License ("CC BY 4.0"). The full text of the Creative Commons Attribution 4.0 license is available here: http://creativecommons.org/licenses/by/4.0/legalcode.
PhET Regular HTML Simulation Files may be freely used and/or redistributed by third parties (e.g. students, educators, school districts, museums, publishers, vendors, etc.) for noncommercial or commercial purposes.
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Transum,
Friday, October 7, 2016
"The 'Explore' option is most effective with activities which guided inquiry enabling students to construct their own understanding. You can find more information about the simulation in the Area Builder Guide and Tips for Teachers."