1/2 = 0.5 1/3 = 0.333... just multiply them together. Pick as much or as little accuracy as you want, 5 x 33 / 10 gives you about how many cm you need. If you need a tighter tolerance, 5 x 333 / 10 is how many mm you need.
Silly Americans would have to learn how to multiply in their heads and how to turn fractions into decimals, but otherwise they could divide lengths in their heads just like everyone else on the planet.
A blade is usually 3.175 mm (1/8" in imperial), you can't subtract a multiple of that, then easily divide the result by 2 or 3 over and over without getting increasingly nasty decimals or losing precision.
Cutting a 100 cm board in half isn't 100/2, it's (100-.3175)/2
If you need to actually divide a board into sixths just do like every other carpenter and mark off lines and cut to the right of the line and not on it exactly. Your last board is short, but they always are whether you marked it off in inches or cm. Take a look at a job sites garbage bin when they're framing, there are tons of ends of boards that routinely get tossed because they couldnt get it exactly right OR they shim the shit out of the last board, lol. They definitely dont divide the board into sixths perfectly including the fact that the width of the blade is going to shave off about 330 mm or about an 1/8th inch
1/2 = 0.5 1/3 = 0.333... just multiply them together. Pick as much or as little accuracy as you want, 5 x 33 / 10 gives you about how many cm you need. If you need a tighter tolerance, 5 x 333 / 10 is how many mm you need.
Silly Americans would have to learn how to multiply in their heads and how to turn fractions into decimals, but otherwise they could divide lengths in their heads just like everyone else on the planet.
A blade is usually 3.175 mm (1/8" in imperial), you can't subtract a multiple of that, then easily divide the result by 2 or 3 over and over without getting increasingly nasty decimals or losing precision.
Cutting a 100 cm board in half isn't 100/2, it's (100-.3175)/2
If you need to actually divide a board into sixths just do like every other carpenter and mark off lines and cut to the right of the line and not on it exactly. Your last board is short, but they always are whether you marked it off in inches or cm. Take a look at a job sites garbage bin when they're framing, there are tons of ends of boards that routinely get tossed because they couldnt get it exactly right OR they shim the shit out of the last board, lol. They definitely dont divide the board into sixths perfectly including the fact that the width of the blade is going to shave off about 330 mm or about an 1/8th inch