Identify the numbers: Identify the numbers to be added.We have two numbers: 54 (a whole number) and 6.598 (a decimal number).
Align the numbers: Align the numbers by their decimal places for addition.Since 54 is a whole number, it is equivalent to 54.000 when aligned with the decimal number 6.598.\begin{align*}
&54.000 \
+ &\phantom{0}6.598
\end{align*}
Add the numbers: Add the numbers starting from the rightmost digit and moving to the left.54.000+6.598---------60.598
Check for errors: Check for any mathematical errors in the addition.The addition was done by aligning the decimal places and adding each column correctly.