To address the situation where a place value is missing, the appropriate action largely depends on the context and the specific mathematical operation being performed. Here’s a breakdown of the potential options you've provided:
A. 0: If a place value is missing, you typically replace it with 0 (e.g., for 203 versus 20).
B. Nothing: This might indicate leaving the number as is, which could be misleading in terms of place value.
C. Remove the last digit: This may be relevant in certain division scenarios, but this is not a standard method for handling missing place values.
D. Subtract without it: This suggests performing subtraction without taking into account the missing number, which might not yield a correct result.
The most logical action, typically used, is to substitute the missing digit with 0 (option A) if you need to maintain the place value system. If the missing digit affects the operation you are performing, you may need to reevaluate how you're approaching that operation in light of the missing information.