# Guess the colour

Is your floor covered in building blocks or LEGO pieces? Place some different coloured blocks in a bag, and take the opportunity to explore mathematical ideas of probability.

### Things you need

• Coloured building blocks
• Bag (for drawing the blocks from).

## The challenge

### Step 1

Count out a number of your childâ€™s building blocks or LEGO bricks and place them in a bag. For example, you could use 6 blocks: 4 red and 2 blue.

### Step 2

Get your child to predict which colour is most likely to be picked out of the bag without any peeking.

Tip:

Get your child to explain their thinking to you after they've told you their guess. Help them reason that you are more likely to select a red block because there are more of them. However, this is not a guarantee.

### Step 3

Take it in turns to predict the block that will be taken out of the bag, replenishing your blocks each time.

### Step 4

Change up the number and colours of the blocks in the bag.

### Step 5

On your last go, if the person's prediction matches what is pulled out of the bag, they have to tidy up the blocks!

### The conversation

As you continue to play with probability with your child, ask them:

• "Are you certain the block in your hand is red? Why?"
• "What's something that is impossible for us to pull out of the bag?"
• "What would happen we added two more blue blocks to our bag?"
• "What's a way that we could change this activity?"