simple math for a simple guy lol

[crosscutter55]

Hi everyone going a little brain dead here i am trying to get deck boards to work out perfectly  by  math . deck board  measures 5 7/16 " +  1/8 " space  = 5 9/16

if the rough deck dim. is 14 ' divided by 5 9/16  = 30.20  how do i convert .20 into a fraction of  an inch  ?? what does 1/5 represent ??

                 not sure i am right but i came up with 3/16 of an inch 

so 30 X 5 9/16 " = 166 7/8 +  3/16" = 167 1/16   / convert to feet is 13'11 1/16  correct   ???

[solver]

Google has the answer.

 

https://www.mathsisfun.com/converting-decimals-fractions.html

[solver]

The .20 is the part of a board and space.

 

You have 5-7/16" boards with a 1/8" gap = 5.5625"

 

5.5625 x 30 = 166.875

 

168 - 166.875 = 1.125

 

Increasing your gap by 1/32 will make up the difference.

[crosscutter55]

i really would rather decrease the size of the deck  in length . Is there a way to figure this without using decimals ??

 

[solver]

5.5625 x 30 = 166.875

 

Subtract 1/8" because you don't need the space after the final board.

 

So your total is 166-7/8" - 1/8" = 166-3/4"

[crosscutter55]

i started the boards from south to north ( north  being the house wall ) so  5 7/16 with the 1/8 in front of that board . Anyway to do this without decimals

[solver]

5 7/16 is (5 x 16) + 7 or 87/16

[solver]

[sharadgames]

YEs we have good calculater for you...https://www-calculator.com/decimal-to-fraction/