IQ = intellectual age/actual age at test × 100

Meaning:

For example, an 8-year-old child's intelligence level is equivalent to a norm of 10-year-old child, so the child's IQ is10/8×100 =125. People with an IQ of 200, 90 ~ 1 10 belong to the normal intelligence range, those with an IQ of 120 ~ 140 are smart people, and those with an IQ of 140 or above are called geniuses. The lower the score, the worse the intelligence. Anyone below 70 points is mentally retarded. Among them, 50-70 points are idiots, 25-50 points are dementia, and 0-25 points are idiots. Intelligence has both genetic basis and environmental influence. Parents have high intelligence, and children often have high intelligence; Parents have average intelligence, while children have average intelligence; Parents are mentally defective, and children's intellectual development may be incomplete. A survey of 122 pairs of identical twins (living in two different places with different living environment and educational conditions) by twin method shows that their intelligence ability is quite similar, which fully proves that intelligence has its genetic basis. There are a few people with excellent talents and poor talents, and most people's intelligence belongs to the middle type. Although intellectual development has a genetic basis, it is also strongly influenced by environmental factors. The genetic basis only stipulates the possibility of intellectual development, that is, the upper and lower limits of intellectual development, and the actual performance of intelligence is influenced by many factors (such as my hard study and social environment). For example, although A has higher intellectual development potential than B, due to certain environmental conditions, B's potential has been fully demonstrated, and its IQ is closer to the upper limit of its potential than A, while A's actual intellectual performance may lag behind B. Therefore, acquired education is extremely important for children's intellectual development, and society, schools and families should cooperate in scientific education according to the laws of children's physical and mental development.