Identify relevant information, ignore distractors, and choose an appropriate operation or representation for a contextual problem.
Match a context to the right setup
Problem
Notebooks cost \(\$3~\text{each}\). Maya buys \(5\) and uses \(\text{one}\) \(\$4\) coupon. Write the setup for the pre-tax amount.
Big Picture
What this problem is really about
Preserve the purchase structure and its units. The price per notebook combines with the number of notebooks to create a dollar subtotal, and the one dollar-valued coupon then reduces that subtotal once. A correct setup keeps the coupon outside the item count because it changes cost, not quantity.
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