THOAN

Girl

Audrey thinks of a number. "If I double my number and add 3 the answer is 21"

Boy

Austin thinks of a number. "If I multiply my number by 2 and add 2 the answer is 14"

Girl

Autumn thinks of a number. "If I add 3 to my number then divide the result by 2, the answer is 9.5"

Girl

Ava thinks of a number. "If I multiply my number by 5 and subtract 6 then multiply the result by 6, the answer is 2 less than 26"

What numbers are they thinking about?

Think Of A Number

Share

Topics: Starter | Algebra | Puzzles

  • C Fleming, Lancashire
  •  
  • Unfortunately the faces on these starters are an excuse to be distracted for some of my pupils.
  • Yr6, CASTERTON PRIMARY SCHOOL
  •  
  • It was quite a challenge but we achieved it!
  • Transum,
  •  
  • While it is certainly possible to solve these problems by trial and improvement, older children could use the 'working backwards' method using inverse operations. Secondary students may decide to use algebra to produce a linear equation to be solved.
    Each time you refresh the page a new set of problems appear.
  • Year 7 St Michaels, St Michaels
  •  
  • We found it hard but did it. We are amazing!
  • Noah, Charnwood Primary Lichfield, Year 6
  •  
  • Not too tricky but you needed to read things carefully or it could catch you out. A good maths starter.
  • Transum,
  •  
  • Here's a different type of THOAN mystery. Think of a three digit number that has all three digits the same. Divide the number by the sum of the digits. I know what your answer is! Is it 37?
  • Mrs Royde, Manchester
  •  
  • The weakest girl in Year 9 bottom managed to work out one of these, much to my surprise. I asked her how she did it, she said 'I worked it out backwards'. I said, 'but you told me you can't do algebra!' She said 'this isn't algebra.' I told her it is, and then showed her how to write it using an x and how to figure it out. She was so chuffed that she had done it that she concentrated and worked brilliantly for the rest of the lesson.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.4 out of 5 based on 413 votes.


Previous Day | This starter is for 1 November | Next Day

 

Answers:

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.



Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

Online Maths Shop

Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=November1

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=THOAN

Student Activity

 


Apple

©1997-2017 WWW.TRANSUM.ORG