A game for two players using the same calculator. ## Preparation- One calculator per pair (there's one on your phone)
- Write the title of this challenge and today's date on a fresh page in your maths journal.
## How To Play The Big One
Have fun exploring The Big One.
We suggest it is used at least three (3) times a week for about fifteen (15) minutes over several weeks. ## Hunting For Whole Numbers- Teach the calculator to divide by 3, or 7 or any other number. Let's pretend you chose 5.
- In your journal write today's date at the top of the page in the middle and write the calculator's number (÷ 5) under the date.
- Put a line down your page for about 10cm.
- Write DO at the top of the left column and DON'T at the top of the right column.
- Your challenge is to find seven (7) numbers that give a whole number answer when you press
**[guess number] =**. - When you find one, write it on the DO side like this.
Example: If you guessed 10 and the calculator's number was (÷ 5) the screen answer would be 2. In your journal on the DO side you write 10 ÷ 5 = 2. Put a box around the 10. - If you make a guess that doesn't give a whole number answer you do the same thing on the DON'T side.
- The aim is to find seven numbers that work without having any DON'T answers.
## Hunting For Patterns- Teach your calculator to divide by any number you want. Keep it single digit to start with.
- Now press
**[guess number] =**and write the equation in your journal. - Do this 15 - 20 times. Each equation is a piece of data.
- Organise your pieces of data to hunt for any patterns?
- Perhaps there are some gaps in your data. What do you need to do?
## Just Before You FinishFor this part you need your maths journal and your Working Like A Mathematician page.- Write at least five (5) ways you are working like a mathematician when you are The Big One activities.
## Answers & DiscussionThese notes were originally written for teachers. They have been shared from the Members section of Calculating Changes, which is a division of Mathematics Centre.
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