As follows:

If a child's IQ is below 7 and accompanied by low social adaptability, it can be considered as mental retardation and should go to the hospital for further examination. There are also grades of mental retardation, with an IQ of 55-69 as mild retardation, 4-54 as moderate retardation, and below 4 as severe retardation.

IQ = intellectual age/actual age ×1. For example, the child above is 6 years old in actual age and 6 years old in intellectual age, so IQ =6 years old /6 years old × 1 = 1; If a 5-year-old child is 7 years old, his IQ is 7 years old /5 years old × 1 = 14; The other is also a 5-year-old child, whose intellectual age is 3 years old, and his IQ =3 years old /5 years old× 1 = 6.

The normal IQ ranges from 7 to 13, with an average of 1. That is to say, if a child's IQ is above 13, it means excellent intelligence, 12-129 means excellent intelligence, 11-119 means intelligent intelligence, 9-19 means medium intelligence, 8-89 means middle intelligence, and 7-79 means critical intelligence.

what is IQ?

Intelligence tests, like measuring height and weight, have evaluation criteria, which is called IQ. IQ is short for intelligence quotient.

IQ was originally based on the concept of intellectual age, and was originally expressed by intellectual age. In the intelligence test, a 6-year-old child can complete the test items of the 6-year-old age group, and his intellectual age is 6 years old. Later, it was found that there were many problems in the calculation of intellectual age, and it was considered that intellectual age could not directly reflect the different levels of intelligence in actual age, so IQ was proposed to evaluate it, that is, the ratio of intellectual age to actual age.