Right from childhood,an individual’s level of intelligence grows with age. I.Q. (Intelligence Quotient) is commonly used as measurement of an individual’s level of intelligence. I.Q. can be measured by a set of carefully designed tests,such as identifying objects, answering general questions and solving simple arithmetical or logical problems. If he performance of a child is what is expected from an average child of  the same age,the child has an I.Q. of 100.If the performance is below average,it is less than 100,and if above average,it is more than 100.