Simultaneous equations

problem

Not a Polite Question

Age

11 to 14

Challenge level

When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...
problem

Whole Numbers Only

Age

11 to 14

Challenge level

Can you work out how many of each kind of pencil this student bought?
problem
Favourite

Sweet Shop

Age

11 to 14

Challenge level

Five children went into the sweet shop after school. There were choco bars, chews, mini eggs and lollypops, all costing under 50p. Suggest a way in which Nathan could spend all his money.
problem
Favourite

Children at Large

Age

11 to 14

Challenge level

There are four children in a family, two girls, Kate and Sally, and two boys, Tom and Ben. How old are the children?
problem
Favourite

What's It Worth?

Age

11 to 16

Challenge level

There are lots of different methods to find out what the shapes are worth - how many can you find?
problem
Favourite

Arithmagons

Age

11 to 16

Challenge level

Can you find the values at the vertices when you know the values on the edges?
problem

Intersection Sudoku 2

Age

11 to 16

Challenge level

A Sudoku with a twist.
problem

Quadruple Clue Sudoku

Age

11 to 16

Challenge level

Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.
problem

Another Quadruple Clue Sudoku

Age

11 to 16

Challenge level

This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.
problem

Intersection Sudoku 1

Age

11 to 16

Challenge level

A Sudoku with a twist.