The steps to manually calculate the curved surface area of a cylinder:

1. Identify the radius (r) and height (h) of the cylinder.
2. Calculate the circumference of the base (C) using the formula:

   C = 2 * π * r

   where π is a constant approximately equal to 3.14.

3. Calculate the area of the base (B) using the formula:

   B = π * r^2

4. Calculate the curved surface area of the cylinder (A) using the formula:

   A = C * h

   where h is the height of the cylinder.

5. Add the area of the base found in step 3 to the curved surface area found in step 4 to get the total surface area (T) of the cylinder:

   T = B + A

6. Round the final result to the desired number of decimal places.

That’s it! You can now manually calculate the curved surface area of a cylinder.