When you have recorded all the data write or draw about anything interesting in the table.
## Special Questions to Think About(You don't even have to look at these if you don't want to.)Mathematicians like to ask unusual questions just for the fun of thinking about them. Questions like these: - What would happen if the teacher called eighteen (18)?
The players can't stand apart like they are social distancing, because that would be groups of 1. What could they do? What would the equation be? - What if the teacher called any number greater than seventeen in the 17 game?
- What would happen if the teacher called zero (0)? Is there an answer?? Could we write an equation??
## More of the Teacher's QuestionsSeventeen is a special number because it has exactly two ways of having zero left overs. If the teacher calls 1 or the teacher calls 17.A number like this is called a Prime Number. A Prime Number has exactly two ways it can make groups with zero left overs. One way is its groups of 1. The other way is the group made by the number itself. - Make a list of all the Prime Numbers up to twenty-five (25).
(Mathematicians say the number 1 is not a prime number. If you want to, you can try to explain why.) - Choose one number that is a prime number up to 25 and one that isn't.
For each of them draw an arrow picture or a table using a few 'call out' numbers. If you want to, you can play the game as you do it, like on the video, but remember to check your number of players two ways. - Make up your own clumping game question and try it out.
## Bob's Buttons QuestionThis is the question Bob made up when he was working with buttons as his pretend people.- Bob's Buttons Question ... Read on screen or print.
## Bob's Extra ChallengesWhen you have worked out the answer to Bob's question and explained it, watch this video and see what you think of Jamie and Jack's explanation.They were in Year 5 when they made the video.
Bob knew something extra and he has given us clues. - Why does the challenge say 'the
*smallest*number of buttons' instead of just 'the number of buttons'? - Why does it say that he had '...more than 10 buttons'?
If you aren't sure about Bob's clues, there is a photo in the Answers & Discussion section that explains what happens if he had less than 10 buttons. But don't look ... unless your really, really can't figure it out for yourself. If you don't have to just find the smallest number of players (buttons), then Bob's challenge has many answers. One answer for the number of players is even smaller than the one in the boys' video and all the other answers are bigger. - Make a list of the first ten (10) answers to Bob's question.
- Describe the pattern.
- What happens if Bob's question was groups of 3 with 2 left over and groups of 5 with 1 left over.
- If there is a pattern of answers, describe the pattern.
- If the 'call out numbers' are 4 & 5 with left overs of 2 & 1 there are many answers to the number of players and there is a counting pattern of ... between the answers.
- If the 'call out numbers' are 3 & 5 with left overs of 2 & 1 there are many answers to the number of players and there is a counting pattern of ... between them.
predict the counting pattern number from the 'call out' numbers.What is it? Explain in your journal. Mathematicians love Bob's Buttons question because it has more than one answer. They love it more because the answers make a pattern. They love it even more because they can ask 'what if' questions and find even more patterns. ## A New ChallengeYour new challenge is to find out more about what happens to the counting patterns when you change the group numbers or left over numbers.A school resource called Maths300 provides free software that helps you explore Bob's Buttons. - Click the link, then scroll down the page to find the software download files.
- The software works on Windows and Mac computers and some Windows tablets.
It*does not*work on phones or iPads. - Ask your parents' permission and help before you download and install.
- Download to your desktop then double click to install.
- Click the program icon (green dart) to start the app.
- Choose Bob's Buttons from the home screen.
- Option 1
...is like the small table in the first video. It has a drawing of a 'playground'. You enter the number of players and they run onto the playground (as red plugs). Then you enter the group size, which is the 'call out' number. Press the spacebar to make the players form groups and find out the number left over. Make sure you predict what will happen before you press the space bar. - Option 2
...allows you to test any 'class size' with any call out numbers and left overs. The results of the your experiments are recorded in an on-screen journal which you can screen capture if you want to. - Option 3
...allows you to enter any Bob's Button question and set the computer to work automatically to find the pattern of answers (if there is one).
## Just Before You FinishRead your Working Like A Mathematician page again and write three or more sentences explaining how you worked like a mathematician.
## Answers & Discussion
Send any comments or photos about this activity and we can start a gallery here.
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