You may also like

problem icon

Euler's Squares

Euler found four whole numbers such that the sum of any two of the numbers is a perfect square...

problem icon

Odd Differences

The diagram illustrates the formula: 1 + 3 + 5 + ... + (2n - 1) = n² Use the diagram to show that any odd number is the difference of two squares.

problem icon

Substitution Cipher

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Under the Ribbon

Stage: 4 Challenge Level: Challenge Level:1

Start with a diagram of a cube just passing under a ribbon.

And maybe put the cube exactly in the middle, just to start with.

Next choose a size for the cube, any size, and calculate how long the ribbon would be if that was the biggest cube that would fit.

Was it 104 cm ? Adjust the cube size and try again ?