The digit 5
occurs in each of the numbers 563 258 1025 67.51 but it has a different
value in each case because of its position. In 563 the 5 stands
for 500. In 258 the 5 stands for 50. In 1025 the 5 stands for 5
units. In 67.51 the 5 stands for 5 tenths.
In the decimal number
system, the value of each position is multiplied by 10 as you move
from right to left.