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Two boys found a pile of bricks in the outdoor playground one day.  They started to compete with each other about who could build the tallest tower. Their interest went on for a few days.

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The problem was that both their towers kept collapsing when they reached a certain height and the boys were getting frustrated. To introduce the concept of measurement we invited the children to count how many bricks they could stack up before the tower collapsed. They counted 13 bricks.

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Then the following conversation took place:

Me: “What is happening to your towers?”

Boy 1: “They go like this” Moving  his hand to indicate that tower was leaning. “It keeps falling down!”

Boy 2: “It is not stable.”

Me: “Stable, that is a very interesting word. What does it mean?”

Boy 2: “It means it can’t stay up. It breaks!”

Boy 1: “Yes, my tower falls down all the time! It is not strong!”

Me: “How do you think you could make your towers stronger and more stable?”

Boys: “I don’t know.”

Me: “Let’s have a think. Look at the bricks, what do you see? Are they all the same size?”

Boy 1: “No. Some are big and some are small.”

Boy 2: “This one is big!” holding a brick over his head.

Me: “What if you try putting the big bricks first and then the little ones?”

And so they did. But when the brick was 15 bricks tall it collapsed again.

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The boys decided that their towers collapsed because the floor was not flat, so theymove the bricks to the a different place so see if that helped.

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One of the boys decided to arrange the bricks in different positions. The strategy didn't work so he went back to staking them horizontally.

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Both boys agreed that stacking the bricks neatly was giving their towers stability and allowed them to build taller towers. They got super excited when the towers started to get taller than them and finally reached 22 bricks high.