To convert 16 inches to mm, you will need to follow these steps:

Step 1: Understand the conversion ratio

Before we begin, it is important to understand the conversion ratio between inches and mm. 1 inch is equal to 25.4 mm. This means that every inch is equivalent to 25.4 mm.

Step 2: Write down the given value

In this case, the given value is 16 inches. You can write it as 16 in.

Step 3: Set up the conversion equation

Using the conversion ratio, we can set up a conversion equation as follows:

16 in = ? mm

Step 4: Cancel out the units

To cancel out the unit of inches, we will multiply 16 in by the conversion ratio of 25.4 mm/in. This will give us the following calculation:

16 in x 25.4 mm/in = ? mm

Step 5: Simplify the calculation

Now we can simplify the calculation by multiplying 16 by 25.4. This will give us:

406.4 mm = ? mm

Step 6: Determine the final answer

The final answer is 406.4 mm.

Step 7: Write the answer in the correct format

The converted unit should be written as 406.4 mm.

Therefore, 16 inches is equal to 406.4 mm.

In summary, to convert inches to mm, you need to multiply the given value (in inches) by 25.4 mm/in. This will give you the equivalent value in mm. By following the steps mentioned above, you can easily convert any unit of length from inches to mm.