To convert 20 inches to centimeters (cm), we will use the conversion factor that 1 inch equals 2.54 centimeters. This means that for every inch, there are 2.54 cm. We can set up a proportion to solve for the equivalent value in cm:

1 inch / 2.54 cm = 20 inches / x cm

Cross-multiply to solve for x:

1x = 2.54 * 20

x = 50.8 cm

Therefore, 20 inches is equivalent to 50.8 cm.

Step 1: Write down the given value.

In this case, the given value is 20 inches.

Step 2: Write down the conversion factor.

We will use the conversion factor 1 inch = 2.54 centimeters.

Step 3: Set up a proportion using the given value and the conversion factor.

1 inch / 2.54 cm = 20 inches / x cm

Step 4: Cross-multiply to solve for x.

1x = 2.54 * 20

x = 50.8 cm

Step 5: Write the final answer.

20 inches is equivalent to 50.8 cm.

Therefore, to convert inches to cm, simply multiply the given value in inches by 2.54 to get the equivalent value in cm. In this case, 20 inches multiplied by 2.54 equals 50.8 cm. This method can be used for any conversion between inches and cm.