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?
Abigail : 2134  Olivia : 4232 
Isabella : 3232  Hannah : 2142 
Samantha : 4131  Ava : 3434 
Ashley : 3423  Sophia : 4431 
Elizabeth : 4211  Alexis : 3241 
Grace : 1232  Sarah : 3114 
Alyssa : 2341  Mia : 4212 
Natalie : 4213  Chloe : 2112 
Brianna : 2412  Lauren : 1123 
Ella : 3344  Anna : 3124 
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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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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Teacher, do your students have
access to computers? 

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