First, the finger memory method "8 multiplication formula"

After discovering the finger secret of the multiplication formula of nine, the author thought: Can you help me remember the multiplication formula of eight in the same way? So, I kept putting out the results of the formula of eight with my fingers: 8, 16, 24, 32, 40 …, and found that the formula has the following rules from one to five:

Hands and fingers straight, fingers open, palms outward.

Eight-eighteenth.

The ring finger and little finger of the left hand are bent, and the other eight fingers are straight, indicating that the result is "8";

286.

Bend the ring finger, middle finger and index finger of the left hand. The little finger on the left hand indicates that the ten digits are "1", and the other six fingers indicate that the unit is "6", and the result is "16".

Three, eight, 24.

Bend the middle finger, index finger, thumb and right thumb of the left hand. At this time, the ten digits of the left little finger and ring finger indicating the result are "2", and the unit is "4" and "24" of the right hand;

Four, eight, three, twelve

Continue to bend the left index finger, thumb and right thumb, index finger and middle finger. At this time, the left "3" is ten, the right "2" is one, and the result is "32";

Five, eight, forty.

Bend the thumb of the left hand and all the fingers of the right hand. Ten digits is "4", one digit is "0", and the result is "40".

Second, the application of finger mnemonic method "8 multiplication formula" in mathematics classroom teaching is conducive to the formation of specific situations, allowing students to learn like games and improving their classroom learning effect.

In primary school, it is difficult for students to concentrate on one thing for a long time. Therefore, in the teaching process, the discovery of the multiplication formula of "8" and its application in mathematics teaching will help teachers create teaching situations, stimulate students' enthusiasm and creativity, and promote students' learning and understanding. Students discover, analyze and solve problems through perception, and finally master theoretical knowledge. For example, when introducing geometric figures such as cuboids and cylinders, students will have some difficulties in understanding and mastering because they have no spatial imagination. Therefore, in the teaching process, teachers can use toys such as building blocks to let students know these geometric figures and make abstract theoretical concepts practical under experience. In this way, students can not only improve their mathematical thinking ability, but also cultivate their spatial imagination and practical ability, and enhance their flexibility and multi-directional thinking.