Find the number in the whole number place 8 and look one place to the right for the rounding digit on the right side of the decimal point 5.Round up if this number is greater than or equal to 5 and round down if it is less than 5.
This can be easily solved, especially with a calculator. With the calculator, you can find that is about 6.4807. Multiply that by 2, you get about 13 inches.
If you can't use a calculator, then you can just estimate. Since we know that is 6 and is 7, is in between them, so you can just say somewhere around 6.5.