### Geoboards

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.

### Polydron

This activity investigates how you might make squares and pentominoes from Polydron.

If you had 36 cubes, what different cuboids could you make?

# Dice Stairs

##### Stage: 2 Challenge Level:

This challenge involves making a 'dice stair' with three steps, as in the picture:

This is how you make a dice stair:

1. Take six dice.
2. Place the dice in three towers: a tower of one, a tower of two and a tower of three.
Each pair of dice faces that touch will only 'stick' if they are matching numbers.
3. Place the towers in the staircase format.
Each pair of dice faces that now touch will only 'stick' if they are matching numbers.
4. The top faces of the dice that make the 'steps' must now show three consecutive numbers in ascending order for this arrangement to be a dice stair.
For example, in the picture above, the top face of the blue dice and the bottom face of the red dice both have matching 3s. The left hand side of the blue dice and the right hand side of the green dice have matching 6s and the bottom of the blue dice has a 4 that matches the top of the white dice. Similar matching is true for all the other dice faces that touch.

CHALLENGE ONE - three steps and six dice
• Make some sets of dice stairs, as described above.
• What do you notice as you explore how to make dice stairs?
• Explain how you found your dice stairs.
• How do you know that you have found them all?

CHALLENGE TWO - four steps and ten dice
• Try the challenge above using four more dice to make dice stairs.
• How have you used what you learnt using six dice?
• How do you know that you have found all the dice stairs arrangements?

CHALLENGE THREE - beyond four steps

What insights do you have that would help you to try to make dice stairs that have five steps?

Justify whatever conclusions you come to when you set out to make your five-step stairs.