# End of Term Maths Fun: Fermi Problems!

Towards the end of the year, in the last couple of weeks of Term 4, I always find it difficult to keep the balance between work and fun. Part of me just wants to kick back and relax with my grade, but the other part knows that if I do I’m bound to face some issues with behaviour.

I realised that the solution is simply to choose relevant, fun activities that are whole-class oriented and allow for some flexibility in timing. Of course, the odd after lunch Christmas craft activity is thrown in too! I have even thrown in a free resource for doing Fermi Problems in your classroom before the end of the year!

Nobel Prize Winner, Enrico Fermi. By Department of Energy. Office of Public Affairs, via Wikimedia Commons

The solution? Fermi Problems. Enrico Fermi (1901-1954) was a physicist who was also famous for amusing his audience with problems. One of the most famous questions he posed was, “How many piano tuners are there in the state of Chicago?” (See the video below for the answer!) A Fermi problem sounds tricky, but anyone can solve them using a series of estimates.

Some examples of Fermi problems are:

1. How many blades of grass are on our school oval?
2. How many people would fit in our classroom standing shoulder to shoulder?
3. How long would it take everyone in our classroom to go down the water-slide at the local swimming pool, twice?
5. how many Mars Bars would it take, lined up end to end, to reach from one end of our school to the other?

These multi-level problems can be introduced around Grade 3/4 (using the scaffold resource in this post) but extended way beyond that into secondary classrooms. My grade have had fun this week, firstly estimating how many cola bottles were in the jar, and then answering and developing some questions of their own!

We brainstormed strategies together to solve the problem.

I asked students to draw their Fermi after I had spent some time describing him, with some crazy results!

The cola bottle prize was an excellent ‘hook’ for the lesson!

To finish this week, we are breaking into four groups on Friday and each constructing 30x30x30cm cubes out of cardboard. I’m then posing the question to them:

“How many full water balloons can we fit into our teams’ cubes?”

Of course, we’ll be finishing with a water fight on the oval!

To all Australian teachers, enjoy your last few days with your grade for 2013! To teachers elsewhere, sorry you don’t have the weather for a water fight! Don’t forget to check out the free resource below.

Cheers,

Teddy.

Click here to access the Fermi problem scaffold that I used with my grade. All I ask is that you retain the watermark to respect the work that has gone into producing the resource and keep sharing this page!

See the video below for a slightly higher-level stimulus to hook students into Fermi problems:

Here are some great links that inspired this post:

http://mathforum.org/workshops/sum96/interdisc/sheila1.html

http://www.edgalaxy.com/numeracy/2012/8/22/an-excellent-collection-of-fermi-problems-for-your-class.html

I’d love to hear what lessons you have been using to have some fun in your classrooms towards the end of the year, please share your ideas in the comments section below!

### 3 Comments on “End of Term Maths Fun: Fermi Problems!”

1. Jamie says:

I am unable to open your drop box form. Is there anyway you can e-mail it to me?

• Teddy Mercer says:

No problem, Jamie. Send me an email via my contact page and I’ll reply with a link as soon as possible.

Teddy.