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Letters for numbers: expressions
Use a letter for an unknown number and simplify expressions.
Number patterns and the nth term
Find the rule of a growing pattern and use it for any step.
Solving equations on a balance
Keep an equation balanced while you find x.
Unknowns on both sides
Solve equations with x on both sides by moving them together.
Straight-line graphs: y = mx + c
Plot a straight line and see what the slope and starting value mean.