Using a grid can help you understand scale factors. It makes it easier to see how much a shape grows when you enlarge it. Here is a rectangle. It has a width of 2 squares and a length of 4 squares.

If a map is drawn using a scale factor where 2 cm represents 3.5 km and the distance between Brora and Golspie is 8.5 km then what would the length of the drawing showing the same distance be?