I was browsing the internet and i found this:
...and i remember how much difficulty i had in maths.
The thing is that i quite liked it but my teacher was really bad at explaining and back then i didn't have yet internet at home, so me and many of my friends had big difficulties and most of us had extra classes after school with a private teacher.
Its funny that whoever draw this did a good job and explaing and i think for people with visual memory it will be easier to remember.