Theory:

General rules to add decimal numbers:
Step 1: Line up the decimal numbers one by one.
 
Step 2: Equalize the number of decimal places by adding zeros at the rightmost side of the decimal number.
 
Step 3: Start adding from the rightmost digit of the decimal number as the usual addition.
 
Step 4: Add both decimal part and whole number part.
 
Step 5: Finally, put a decimal point in the answer in the same place as the numbers above it.
Example:
Add \(456.23\) and \(56.026\).
 
Here, to equalize the decimal places, add zero at the end of \(456.23\).
 
456.230+56.026¯512.256
 
Therefore, the addition of \(456.23\) and \(56.026\) is \(512.256\).
Example:
Find the sum of \(23.592\), \(34.467\) and \(56.83\).
 
Here, to equalize the decimal places, add zero at the end of \(56.83\).
 
23.59234.467+56.830¯114.889
 
Therefore, the sum of \(23.592\), \(34.467\) and \(56.83\) is \(114.889\).