The purpose of this task is to engage students in converting metric units to solve a problem.

The background knowledge and skills that need to be established before and/or during this task are outlined in the diagram below:

This task may be carried out with step by step guidance, or by allowing the student to follow their own method of solution. The approach should be chosen in sympathy with students' skills and depth of understanding.

Task: The organisers of a winter festival are planning to construct a ramp to be used as a ski jump in the main street of town.

They are going to make snow with a machine that uses 4 gallons of water every minute (5.14 L per min) and can only function when the air temperature low enough. They estimate that they will have 6 hours of time overnight to make snow.

If the ramp is supported by posts that can hold up to 500 kg each, how many posts will be needed for the structure to safely hold the snow that will be made.

### The arithmetic approach (show more)

- The student is able to follow the steps given to solve a decimal word problem requiring conversion of metric units.

### The conceptual approach (show more)

- The student is able to solve a decimal word problem requiring conversion of metric units.