The letters in the following addition sum represent the digits 1 ... 9. If A=3 and D=2, what number is represented by "CAYLEY"?
In a league of 5 football teams which play in a round robin tournament show that it is possible for all five teams to be league leaders.
If you take a three by three square on a 1-10 addition square and multiply the diagonally opposite numbers together, what is the difference between these products. Why?
Bellringers have a special way to write down the patterns they ring. Learn about these patterns and draw some of your own.
The sum of each column and row in this grid give the totals as shown. What number goes in the starred square?
Can you picture how to order the cards to reproduce Charlie's card trick for yourself?
Rather than using the numbers 1-9, this sudoku uses the nine different letters used to make the words "Advent Calendar".
An extra constraint means this Sudoku requires you to think in diagonals as well as horizontal and vertical lines and boxes of nine.
