Answer:
This describes the limitations of short-term memory.
Explanation:
Short-term memory refers to the memory the individual is immediately aware of but if no manipulation of it occurs, it could be forgotten in a short time and not be stored in the long-term memory. It has a limited capacity.
In this case, we can see a limitation of this type of memory since you see the number and tell yourself you'll remember it. However since you did not manipulate the information by repeating it, for example, the number is soon forgotten.