She painted a red dot on the corner on every second square
Then she put a blue cross on every third square.
Then she put a green triangle on every fourth square.
And she put a black square on every fifth square
So there was nothing on the first square.
Can you make a pattern like this?
How many other squares had no decoration? Which squares were they?
Did any squares get three decorations? Which ones? Why?
Did any squares get all four decorations? Which ones? Why?