Hello I have been trying to solve this math word problem, I tried drawing a diagram and I came to the answer 2 but I am not sure about my answer and would appreciate some help Thanks!
Here is the question:
The interiors of all the unit squares of a 10 by 10 board are to be painted. Any two squares that have a side in common will be painted with a different colour of paint. What is the least number of colours that will be needed?