Kids learn to count with their fingers because they're so convenient! Most number systems developed as people counted using their fingers.
The counting system of native（本地的）Greenlanders not only uses all ten fingers, but all ten toes as well! Here's how it works. The Greenlandic word for the number seven translates as "second hand, two". That means you count five on the first hand and add two from the second to make seven. After you run out of fingers, go for the toes. Thirteen translates as first foot, three". That means you add ten fingers plus three toes.
The connection between fingers and counting is so close that several languages have just one word means both "hand" and the number five. Even in English, the word digit describes either a number or a finger. So if anyone teases (取笑)you for counting with your fingers, just tell them you find your digits quite handy!
