Step 1: Understand the units

Before beginning the conversion, it is important to understand the units involved. Inches (in) and centimeters (cm) are units of length. 1 inch is equal to 2.54 centimeters.

Step 2: Write down the given value

In this case, the given value is 70 inch. Write it down as 70 in.

Step 3: Set up the conversion equation

To convert inches to centimeters, we use the conversion factor 2.54 cm = 1 in. This means that 1 inch is equal to 2.54 centimeters. We can set up our conversion equation as follows:

70 in x 2.54 cm/1 in = ? cm

Step 4: Cancel out the units

To easily solve the equation, we can cancel out the units present on both sides. In this case, the inches on the numerator and denominator will cancel out, leaving us with centimeters as our final unit.

Step 5: Solve the equation

To find the value of ? cm, we simply need to multiply 70 by 2.54. This can be done using a calculator or manually as follows:

70 x 2.54 = 177.8

Therefore, 70 inches is equal to 177.8 centimeters.

Step 6: Write the final answer

The final answer is 177.8 cm. It is important to always include the appropriate unit in the final answer.

Step 7: Check your work

To ensure that you have the correct answer, you can check it using an online conversion tool or by working backwards. To work backwards, divide 177.8 cm by 2.54 cm/in. The result should be 70 in, which confirms that we have the correct conversion.

Congratulations, you have successfully converted 70 inch to cm! Repeat the same steps when converting between other units of length.