Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.
Use the differences to find the solution to this Sudoku.
Five equations and five unknowns. Is there an easy way to find the unknown values?
The illustration shows the graphs of fifteen functions. Two of them have equations $y=x^2$ and $y=-(x-4)^2$. Find the equations of all the other graphs.
Investigate the transformations of the plane given by the 2 by 2 matrices with entries taking all combinations of values 0, -1 and +1.
A Sudoku based on clues that give the differences between adjacent cells.
A pair of Sudokus with lots in common. In fact they are the same problem but rearranged. Can you find how they relate to solve them both?
Starting with two basic vector steps, which destinations can you reach on a vector walk?
How would you design the tiering of seats in a stadium so that all spectators have a good view?
