It must be a rational number. By observing the decimal, we can know that the unit of the sum of the first two digits is equal to the third place, so we can know that if there are two identical consecutive digits in the decimal, it is an infinite cycle decimal. And because there are * * *10×10 =100 kinds of continuous numbers, there must be two identical continuous numbers before the decimal point, so the decimal point must be an infinite cycle decimal number and a rational number.