1, fast calculation with fingers, and each hand can indicate from 1 to 10 respectively. One hand represents one place and the other hand represents ten places.

Take the right hand as an example: the thumb stands for 5, and the other four fingers stand for 4 1 respectively. When we count, 0 stands for fist, 1 stands for forefinger, 2 stands for forefinger and middle finger, 3 stands for forefinger, middle finger and ring finger, and 4 stands for forefinger, middle finger, ring finger and little finger.

5 is represented by a single thumb, 6 by thumb and forefinger, 7 by thumb forefinger and middle finger, 8 by thumb forefinger, middle finger and ring finger, and 9 by thumb forefinger, middle finger and ring finger. The left index finger indicates 10. The left hand is the same as the right hand, except that the left hand means 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

2. Elementary: addition and subtraction within 100?

Preparation: Before reading the following formula and playing related finger games, the teacher needs to give the password "Clear", and the children will clap their hands immediately, then hold their fists on their chests and concentrate on getting ready. (Note: the palms are inward, and the distance between the two fists is based on the convenience of the fingers, not too close or too far. )?

First, the finger positioning formula?

I have a pair of hands, representing ninety-nine; Set the left hand to ten, and I can count to ninety; ? Pose your right hand and count from one to nine; It's convenient to add and subtract, so don't worry about calculation. ?

Second, the number of fingers is fixed?

The index finger extends "L" and the middle finger extends "2"; ?

The ring finger is "3" and the little finger is "4"; ?

Four fingers and a thumb, the thumb is "5" to remember; ?

Then extend the index finger to the little finger, and "6", "7", "8" and "9" are arranged in numbers.