To move the decimal you must move the decimal in the divisor all the way to the right to make it a whole number. Then in the dividend, you move that decimal to the right the same amount of spaces you did in the divisor.
If you have a decimal, move the decimal point two places that way ---> to get percent.
If you have a fraction, divide the top by the bottom to get the decimal. If you have a decimal, move the decimal point 2 places that way --> to get the percent. If you have percent, move the decimal point 2 places this way <-- to get the decimal.
Left or right.
A decimal is a way of representing numbers, it has no measure itself. So 413 km, in decimal is exactly 413 km!
I assume you are talking about which way the decimal place would go. There are 10 millimetres in a centimetre. I.e. a millimetre is smaller than a centimetre. So when you're talking about decimal places, it would move to the left. This is because you need to divide.
Left or right - depending on what you are trying to do.
One kilometer = 1000 meters. To write it another way, 1.000 km = 1000 m Notice that all you had to do here was move the decimal point 3 places. So 1931.21 meters = 1.93121 kilometers.
Take the number of centimeters, move the decimal point 2 places this way and you have centimeters.