A research on 6.514 primary-school pupils including 3.298 schoolboys and 3.216 schoolgirls from the age of 6 to 10 in three ecological areas: urban, rural and mountainous areas in Binh Dinh Province revealed that the intelligence quotation and memory of the children increase gradually with age. The intelligence quotation of children from 6 to 10 years of age is 87.46; 96.77; 102.95; 107.54; and 110,81 points, respectively. On average, it increases by 5.86 points or 6,67 % per year. Short-term memory by sight and hearing increases with age. Children from the age of 6 to 10 can memorize visually better than aurally, therefore, visual teaching method should be strengthened in primary education. The development of intellectual abilities of children is different when the pupils live in various ecological areas with the urban pupils having the best values. This shows that the environment has an influence on the development of children’s thinking.
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