Addition, subtraction, multiplication, and division of significant digits. Enter numbers, exponential or electronic, and select an operator. When using the calculator, if you do all the log calculations without storing the intermediate results, you will not determine if an error was made. Even if you realize that an error has occurred, you will not determine where the error occurred. For long calculation with mixed operations, enter as many digits as possible in the entire calculation set, and then round the final result accordingly.