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Codebreakers

Calling all maths detectives!

This feature focuses on lots of fun problems for children to solve. They will need to think creatively, use their reasoning skills and their problem-solving strategies to solve the mysteries hidden in our carefully selected NRICH tasks.
Codebreakers link

Codebreakers 

This article for Primary and Secondary teachers is all about the mathematics behind solving puzzles, unravelling mysteries and breaking codes.

Count the Digits link

Count the Digits live

Stage: 1 and 2 Challenge Level: Challenge Level:1

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 ... link

I Like ... live

Stage: 1 Challenge Level: Challenge Level:1

Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?

Secret Number link

Secret Number live

Stage: 1 Challenge Level: Challenge Level:2 Challenge Level:2

Annie and Ben are playing a game with a calculator. What was Annie's secret number?

What Number? link

What Number? live

Stage: 1 Short Challenge Level: Challenge Level:2 Challenge Level:2

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.

Number Detective link

Number Detective live

Stage: 2 Challenge Level: Challenge Level:1

Follow the clues to find the mystery number.

Coded Hundred Square link

Coded Hundred Square live

Stage: 2 Challenge Level: Challenge Level:1

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

Mystery Matrix link

Mystery Matrix live

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.

Curious Number link

Curious Number live

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

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 Statements link

Satisfying Statements live

Stage: 2 and 3 Challenge Level: Challenge Level:1

Can you find any two-digit numbers that satisfy all of these statements?