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12 cards from this deck
Unknown values/quantities
Choose a letter (variable) for an unknown quantity
Write expressions for other unknowns using your letter
Set up equation using the total/relationship given
Replacing variables with actual numbers
A value that makes the statement incorrect
Only one
2×(length+width)2 \times (\text{length} + \text{width})2×(length+width)
Catch errors and ensure solution makes sense
Substitute answers back into original problem
Conditions satisfied, arithmetic correct, question answered
Prevents confusion with multiple unknown measurements
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