# Lego Domino Challenge

The Lego Domino Challenge is a fantastic way to get kids using maths and construction skills while having fun!

# What is the Lego Domino Challenge?

The Lego domino challenge is for a small Lego domino (which you build using Lego) to knock down a gigantic Lego domino (which looks like a huge Lego wall). Is this even possible?

If you just take a small Lego domino and flick it against a gigantic Lego wall, it would be easy to think that there’s no way something so tiny could ever push over something of titanic proportions.

However, there’s a secret which involves the use of a bit of maths.

By using a simple mathematical formula, it IS possible for a small Lego domino, with the help of a few buddies, to push over a gigantic Lego domino!

Scientists have found that a Lego domino will knock over a domino that is one-and-a-half times bigger. So that’s what we did. We created a row of Lego dominoes, each one-and-a-half times bigger than the Lego domino before it.

## How Big Should the Next Lego Domino Be?

To help work out how big to make the next domino, we calculated the size of each Lego domino by multiplying the …

depth x width x height.

For example, the first domino we built was …

1 block deep x 2 blocks wide x 2 blocks high = 4 blocks

The next domino we built was one-and-a-half times bigger than 4 blocks. We worked out how many blocks we’d need …
4 x 1.5 = ?
(4x1) + (4 x.5) = ?
4 + 2 = 6 blocks

… then we arranged 6 blocks into a Lego domino (1 block deep x 2 blocks wide x 3 blocks high).

As long as the next Lego domino is never bigger than one-and-a-half times bigger than the previous Lego domino, it will work!
Hint: to make all our Lego blocks rectangular, some of our Lego dominoes were a little less than one-and-a-half blocks bigger.

By the way, after about the tenth Lego domino, we moved from building single-block-width-dominoes to double-block-width-dominoes. This was because we ran out of single-width-blocks. I don't think you can start with double-width-blocks because the base would be too wide. However, further down the Lego domino chain, they worked fine.

## Lego Domino Challenge Video Clip

Want to see how the Lego Domino Challenge in action? Click on this short video clip:

It was fascinating seeing how something so small can cause a chain reaction that eventually moves a massive object.

## Lego Domino Challenge: Team Work in Action

On a side note, the Lego Domino Challenge would be a really good way of talking with children about ‘team work’: we can often achieve more working together with others!

We’d love to see the Lego domino challenge that you create with your Lego. Feel free to leave a photo on our facebook page or a comment on this post.

Have fun!

Before you go, have a look at some of the other fun maths projects we’ve explored as well as our children’s books ...

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