First, to calculate one tenth of a number, you have to multiply it by .1 or move it one place/spot to the right in the number. The next step would be to identify two number next to each other that are identical. In the number 233,649, the 3 in the 10,000 place and the 3 in the 1,000 place would meet this requirement. As a result, if you were to multiply 30,000 (3 in 10,000 place) by .1 you would get 3,000 (3 in 1,000 place). The answer would be the 10,000 and 1,000 place contain digits that on one tenth the value of each other.