An introduction to proof by contradiction, a powerful method of mathematical proof.
This group tasks allows you to search for arithmetic progressions in the prime numbers. How many of the challenges will you discover for yourself?
A game in which players take it in turns to choose a number. Can you block your opponent?
Take any prime number greater than 3 , square it and subtract one. Working on the building blocks will help you to explain what is special about your results.
How many divisors does factorial n (n!) have?
Can you make lines of Cuisenaire rods that differ by 1?
A short challenge concerning prime numbers.