Final answer:
The subject of this question is Mathematics. The increase in routine math errors is attributed to the increase in electronic filing.
Step-by-step explanation:
The subject of this question is Mathematics. The question specifically mentions routine math errors, which indicates that the topic being discussed is related to mathematics. The increase in routine math errors is attributed to the increase in electronic filing. This suggests that there is a connection between electronic filing and the occurrence of math errors, which is a topic that falls within the domain of mathematics.