To convert 13 mm to inches, you will need to use the conversion factor between millimeters and inches. The conversion factor is 1 inch = 25.4 mm. This means that for every 25.4 mm, there is 1 inch.

Step 1: Write down the given value, which is 13 mm.

Step 2: To convert mm to inches, we need to divide the given value by the conversion factor. In this case, 13 mm divided by 25.4 mm = 0.512 inches.

Step 3: Round the result to the desired number of decimal places. In this case, we will round to two decimal places. Therefore, the final calculation will be 0.51 inches.

Step 4: Write down the answer, which is 0.51 inches.

Therefore, 13 mm is equivalent to 0.51 inches.

You can also double check your answer by reversing the conversion. To do this, multiply the given value (0.51 inches) by the conversion factor (25.4 mm). The result should be equal to the original given value of 13 mm. In this case, 0.51 inches multiplied by 25.4 mm = 12.954. Since this answer is very close to the original given value, it confirms that our conversion is correct.

In summary, to convert 13 mm to inches, divide the given value by the conversion factor (1 inch = 25.4 mm) and round the result to the desired number of decimal places. Or, you can also multiply the given value by the conversion factor to double check your answer.