Calling all maths detectives!
Can you solve the mysteries hidden in our carefully selected NRICH tasks?
Can you solve the mysteries hidden in our carefully selected NRICH tasks?
![Codebreakers](/sites/default/files/styles/medium/public/thumbnails/content-id-13332-icon.jpg?itok=GSNRU7v9)
article
Codebreakers
This article for Primary and Secondary teachers is all about the mathematics behind solving puzzles, unravelling mysteries and breaking codes.
![Count The Digits](/sites/default/files/styles/medium/public/thumbnails/content-id-7302-icon.jpg?itok=VO-76EUV)
problem
Count The Digits
In this investigation we are going to count the number of 1s, 2s, 3s etc in numbers. Can you predict what will happen?
![I Like ...](/sites/default/files/styles/medium/public/thumbnails/content-id-6962-icon.gif?itok=iN64Angn)
problem
I Like ...
Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?
![Secret Number](/sites/default/files/styles/medium/public/thumbnails/content-id-5651-icon.png?itok=JIKXpI6V)
problem
Secret Number
Annie and Ben are playing a game with a calculator. What was Annie's secret number?
![What number?](/sites/default/files/styles/medium/public/thumbnails/content-00-02-penta1-icon.gif?itok=zPVOEIUL)
problem
What number?
I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.
![Magnifying glass](/sites/default/files/styles/medium/public/2024-08/Number%20Detective%20featured%20image.png?itok=Ny7JLNxz)
![Coded hundred square](/sites/default/files/styles/medium/public/thumbnails/content-id-6554-icon.png?itok=NQUPJ0QK)
problem
Coded hundred square
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
![Mystery Matrix](/sites/default/files/styles/medium/public/thumbnails/content-01-09-penta2-icon.png?itok=QvnkPfB_)
problem
Mystery Matrix
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
![Curious number](/sites/default/files/styles/medium/public/thumbnails/content-id-7218-icon.png?itok=yakj4l75)
problem
Curious number
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?
![Satisfying Four Statements](/sites/default/files/styles/medium/public/thumbnails/content-id-13377-icon.png?itok=N2oWvFPQ)
problem
Satisfying Four Statements
Can you find any two-digit numbers that satisfy all of these statements?