For example, suppose we have a number 72.564, these are place values representation for various digits in the number.
Number 7 and 5 are in tens place, 2 in units place, 6 in hundreds place and 4 in thousands place. So based on place values of different digits in the Numbers we write the number of digits below it. In our example 72.564, below digit 5 we will have two digits written as 1 / 10. Similarly for 6 we will write 1 / 100 and for 4 it will be 1 / 1000. Overall number of digits below 72.564 will be written by removing the decimal point as: 72564 / 1000 because of decimal point after 3 digits. When we add or subtract numbers with Decimals, decimal point location must be at same place. The result will have same number of digits after decimal, like we had in one with maximum numbers. For example:
Adding 72.4 and 72.42 we will write it as:
72.40 + 72.42 = 144.82,
Subtracting 72.2 from 72.42 we would write it as:
72.42 – 72.40 = 0.02,
Thus we see that number of digits after decimal is made equal by padding the number with 0’s matching the number with maximum decimal digits.