The teacher thinks of a four digit number made up of digits in the range 1 to 4. Each student guesses what the four digit number might be. The teacher gives one tick for each digit the student has in the right place. What number is the teacher thinking of?
Diego : 3421  Brian : 1214 
Adam : 2414  Adrian : 3134 
Kyle : 2441  Eric : 1114 
Ian : 4243  Nathaniel : 1133 
Carlos : 4113  Alex : 4413 
Bryan : 3231  Jagdish : 3132 
Julian : 1213  Sean : 4143 
Carter : 2331  Hayden : 1231 
Jeremiah : 2333  Cole : 3223 
Brayden : 4332  Wyatt : 2214 
Note for Teacher: All of the students guesses above will probably not fit on the screen at the same time. You may wish to keep the lower guesses hidden so as not to make the activity too easy.
Topics: Starter  Logic  Puzzles
Y5/6 working hard on the @Transum starter of the day. Fabulous maths reasoning and thinking skills. We love maths! pic.twitter.com/erhZztb4Nc
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1314
Change Numbers: 

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 a button above to regenerate another version of this starter from random numbers. There is a choice of three levels; easy, medium and hard.
Advanced: Finding a unique solution may not be possible. 

Possible strategy: Make a grid showing the possible digits which could appear in each of the four positions. By looking at the clues which do not have any ticks by them, cross of the digits which can't appear in each position.
There should now be only a limited choice for the correct digits:
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Here is the URL which will take them to a student version of this activity.
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