Expressions with algebra tiles
This activity introduces expressions with unknown variables and constant terms.
Ask students to match the models to the statements. Ideally they should already be familiar with base blocks and algebra tiles.
Next move the change x slider above to show that x is variable and the units are constant.
Move the slider to change the value of x. When does 3x + 2 = x + 6?
When is 3x+2 > x+6?
When is 3x+2 < x+6?
Algebra tiles and graphs
Equations and graphs
Solve equations and inequalities by moving the slider and comparing the bar model to the graph.
Solving Linear Equations
3 - x + x = x - 4 + x
3 + 4 = 2x - 4 + 4
Change x and y until the bars are equal.
Simultaneous equations by elimination
2x + y = 7
x - y = 2
Add the two equations together to get the image below.
3x + y - y = 9
The zero pair highlights the elimination.
3x = 9
x = 3