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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.