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Have you ever think of using a digital algebra tiles website to help students to visualise the concept of collecting like terms?
Algebra Tiles (mathigon.org) seems to be the most user friendly page to use.
Click HERE for tutorials for how to use algebraic tiles
In the hope of applying the theory of Concrete --> Pictorial --> Abstract Approach.
I have tried using the above balancing scale method for Year 9 set 3.
However, students struggled to understand the concept and they were very reluctant in trying the questions.
They find it more comfortable with a procedural method.
Here are the fluency based worksheets I created for them:
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