To convert centimeters to inches, you can use the following formula:
1 inch = 2.54 cm
So, to convert 21 cm to inches, you would divide 21 by 2.54:
21 cm / 2.54 = 8.27 inches
Therefore, 21 cm is equal to 8.27 inches.
Real-life example:
Let’s say you have a ruler that measures in centimeters, and you want to know how many inches a 30 cm long object is. By using the conversion factor of 1 inch = 2.54 cm, you can calculate that 30 cm is equal to 11.81 inches.
FAQs:
1. Why do we need to convert units?
Converting units allows us to easily compare measurements in different systems and use them in calculations. It also helps in understanding measurements in a more familiar unit.
2. Can I convert units without using a conversion factor?
While it is possible to convert units without a conversion factor, using a conversion factor ensures accuracy and consistency in the conversion process.
3. Is there a simple way to remember the conversion between centimeters and inches?
One common mnemonic to remember the conversion is “2.54 cm in an inch, that’s the rule that’s very plain.”
4. Can I convert other units using the same method?
Yes, you can convert between different units by using the appropriate conversion factor. Just make sure to divide or multiply the original value by the conversion factor to get the desired unit.