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?
Ava : 4242  Ashley : 3423 
Sophia : 3231  Elizabeth : 1233 
Alexis : 4112  Grace : 3241 
Sarah : 1224  Alyssa : 3323 
Mia : 2134  Natalie : 1111 
Chloe : 3433  Brianna : 3114 
Lauren : 1321  Ella : 2243 
Anna : 4244  Taylor : 1112 
Kayla : 4132  Hailey : 1432 
Jessica : 2143  Victoria : 2424 
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.
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2342
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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Teacher, do your students have
access to computers? 

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