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Shopping Subtraction Challenge

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Shopping Subtraction Challenge

Solve each shopping problem. Show your working and use Australian dollars. Estimate where asked, then check whether your exact answer is sensible.

Shopping totals and change

Use subtraction to find what remains after shopping, or work backwards from the change.

1.Oliver takes $90.00 to the shops. She buys a backpack for $36.80, a drink bottle for $17.45 and a snack for $8.75. How much money does she have left?

2.A game console costs $275.00. A discount of $48.00 is taken off the price. If Isla has $200.00, how much more money does he need to pay the discounted price?

3.Luca has $60.00 for groceries. He spends $19.65, $8.20 and $14.35. First round each cost to the nearest dollar to estimate his change. Then calculate the exact change.

4.At a bookshop, Matilda buys four identical books for $12.60 each and receives $19.60 change. How much money did she hand over?

Check and explain

Choose a useful checking method, then use estimation to reason about a shopping total.

5.Which calculation is the best way to check the answer to Oliver's shopping problem?

Add the three item prices to the money left; the total should be $90.00.
Subtract the money left from $90.00 and check that the result is smaller than each item price.
Add $90.00 to the three item prices.

6.Arjun starts with $80.00 and has $26.40 left after shopping. One purchase was a board game costing $31.50. What was the total cost of her other purchases?

7.Use rounding to explain why Arjun's other purchases costing about $22 is reasonable.

Make a shopping challenge

Write your own problem using at least three purchases and a $100 budget, then solve it. Since answers will vary, use the sample answer as a guide.

8.Create a shopping story with at least three items. The shopper pays with $100.00. Include prices that leave some change, and state what the shopper needs to find.

9.Solve this sample shopping problem: Eli buys a cap for $18.50, a ball for $24.25 and a water bottle for $12.75. How much change does he receive from $100.00?

10.A jacket costs $80.00 and is discounted by 25%. Estimate the discount by finding 25% of about $80, then calculate the exact discount and sale price.