Activity: Design a Deck

Alex wants to build a deck for the house.

It should be shaped about like this:

deck 4m x 2m

Alex can buy some beautiful hardwood, but it is only available in the following sizes:

  • Width: 90 mm
  • Lengths: 3.0 m, 3.6 m, 4.2 m, 4.8 m, 6.0 m

Please tell Alex how many of each length he will need.

Note: Be Practical! Think about actually using real boards to make this deck.

  • Alex can cut the boards into smaller lengths, but not into smaller widths.
  • Tell Alex if the shape he wants needs to be changed to fit the boards (but not by too much or it won't fit the house!)
  • You should order extra boards in case some are bad quality, or Alex makes a mistake when cutting.


Another practical thing: you don't want cuts to line up, so having two boards of 3.0m exactly next to each other is bad.

Also try for a different size of deck ... maybe one that suits your house.