Step 1: Understand the basics
Before we begin converting units, it’s important to understand the basics of length measurements. Millimeters (mm) and inches (in) are both units used to measure length. Millimeters are a smaller unit, commonly used for smaller objects like jewelry or machinery parts. Inches, on the other hand, are a larger unit, commonly used for measuring height or length in everyday objects like furniture or clothing.
Step 2: Know the conversion factor
To convert from millimeters to inches, we need to know the conversion factor. A conversion factor is a number that is used to convert between two different units. For millimeters to inches, the conversion factor is 1 inch = 25.4 millimeters. This means that there are 25.4 millimeters in every inch.
Step 3: Set up the conversion
To convert 21mm to inches, we need to set up a conversion equation. The conversion equation is: [value in millimeters] x [conversion factor] = [value in inches]. In this case, our equation will be 21mm x 1 inch/25.4mm = [value in inches].
Step 4: Convert millimeters to inches
Using our conversion equation, we can now convert 21mm to inches. Simply plug in the values and solve for the missing variable. In this case, our equation will be 21mm x 1 inch/25.4mm = [value in inches]. Plugging in the values, our equation becomes 21mm x 1 inch/25.4mm = 0.82677 inches. This means that 21mm is equivalent to 0.82677 inches.
Step 5: Round to the appropriate decimal place
In most cases, it is appropriate to round our final answer to the nearest hundredth place. Since our final converted value, 0.82677 inches, has more than two decimal places, we can round it to 0.83 inches.
Step 6: Include units in the final answer
When providing the final answer, it is important to include the appropriate units. In this case, our final answer will be 21mm = 0.83 inches. This tells us that 21 millimeters is equal to 0.83 inches.
Congratulations, you have successfully converted 21mm to inches! Remember to always double check your calculations and to use the correct conversion factor for the units you are converting. With practice, converting between units of length will become easier and more intuitive.