Exploring diagonals (bold grid)
- Z Latymer, NRICH Maths project
Move the top right-hand corner of the rectangle. Can you work out what the purple number represents?
Here are a couple of questions you might like to consider: Can you make a rectangle with a purple number of 24? Is there more than one? If I tell you the coordinates, can you find a quick way to work out the purple number? What other interesting questions can you think of to explore?