Answer Guidance

Item 1: A is $2 per notebook. B is $1.80 per notebook. B has the lower unit price. If a student divides notebooks by dollars, ask which quantity the problem asks them to find for one notebook.

Item 2: The packs contain different numbers of notebooks. A valid revision states that B costs $0.20 less per notebook. Accept a clear equivalent explanation.

Item 3: 4 divided by 5 = $0.80 per pen. After reteaching, the recheck answer is $0.75 per pen. Use the observed response pattern to decide on support.

Item 4: Buying only A requires 4 packs, costs $24, and yields 12 notebooks. Buying only B requires 2 packs, costs $18, and yields 10 notebooks. B meets the exact quantity at a lower cost. If students buy fractional packs, revisit the whole-pack constraint.

Exit ticket: A is $1.50 per liter. B is $1.40 per liter. B has the lower unit price. A may suit a shopper who needs only 3 liters or cannot spend $7. Accept a justified budget, storage, or quantity reason.

Quick scoring: one point for each correct rate and one for a justified decision. A calculation error with a sound method needs different feedback than reversed units. Sort exit tickets into ready to transfer, calculation support, and unit-rate reteaching.