# Parking meters

Achievement Objectives
GM3-1: Use linear scales and whole numbers of metric units for length, area, volume and capacity, weight (mass), angle, temperature, and time.
Student Activity

In parking meters downtown, you can get 15 minutes parking for 50c.

Dad put \$3.50 into the parking meter at 3.15pm.

At what time did the parking meter expire?

Specific Learning Outcomes
Calculate using units of time and money
Communicate their reasoning clearly and using the correct units.
Devise and use problem solving strategies to explore situations mathematically (be systematic)
Description of Mathematics

This is a practical problem relating to analogue or digital time, and money.

Required Resource Materials
Activity

### Problem

In parking meters downtown, you can get 15 minutes parking for 50c. Dad put \$3.50 into the parking meter at 3.15pm. At what time did the parking meter expire?

### Teaching sequence

1. Introduce the problem with a short discussion about parking.
How much does it cost? Has your car ever been towed away? Have you ever been given a parking ticket?
2. Give the students the problem to solve with a partner. As they work ask questions that focus on the strategies they are using to make the calculations.
How did you work that out?
How can you convince me that you are correct?
Can you think of another way to solve the problem?
3. Ask the students to record their solution so that others could be convinced that they were correct.
4. Share the records. Dicuss whether the students have used digital or analogue time.

#### Extension to the problem

Get the students to write their own parking meter problem for others to solve.

#### Solution

\$3.50 = 7 x 50c. 7 x 15 minutes = 105 minutes. 105 minutes = 1 hour and 45 minutes. 3:15 + 1:45 = 5:00. So Dad can park in the car park up until 5 pm.

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