As Lynn Steen in The Science of Patterns says, I think Mathematics is the science of pattern too.

I have a 10 years old student which is weak in mathematics. It seems he can do arithmetic(addition, multiplication, ...) but cannot understand the meaning of problems and their relation to real word. I want to help him to rebuild foundation of his mathematics and promote his creativity and attention to real world. Now with respect to the role of patterns in mathematics, I want to start with them.

Do you know free (probably online) resources like PDF files which have much exercises in various flavors or have ideas for me to make them? I know I can build exercises by paying attention to the world, but the time is important for me and it is better to use ideas of other peoples. Also my approach is to hold enjoyment and so, games have advantage.