Things i dont really understand in Kingston

The first thing i realised about Canada that really troubled me was the coin problem. Basically they have 5 different denominations of coins. Almost as bad and confusing as the church. The lowest value is the 1cent coin which looks like the old Singaporean 1cent. Copper coloured and rather tiny. The next is a 5 cent coin that is actually thick and quite big. The 5 cent is actually thicker and bigger than the 10 cent coin. In fact the 10 cent is minisculy smaller than the 1 cent but of the same thickness. Only that the 10 cent coin is silver and the 1 cent is copper. There is also the 25 cent coin. YES!! A 25 cent coin. Which i think is roughly twice the size of a 10 cent coin but of the same thickness. Next we have the 1 dollar coin which is gold in colour. The 2 dollar coin is slightly bigger than the 1 dollar coin and is silver with a golden centre. Which means i was wrong at the start. There are 6 different canadian coins, not five.
For instance, I paid for dinner today which was $9.15. I cleverly gave the vendor exactly $10.15, 2 five dollar notes and one 10-cent coin and one 5-cent coin. In the end he gave me back 4 , 25-cent coins.