### Instruction: Find the units digit of $13 \cdot 41$.### Response: To find the units digit of a product, I only need to look at the units digits of the factors.
The units digit of 13 is 3, and the units digit of 41 is 1.
To multiply 3 by 1, I just get 3.
So the units digit of 13 \cdot 41 is 3.