How many kilobytes in one gigabyte (in decimal)?

The answer is not 1000000, it is 1000000 kilobytes in one gigabyte in binary (base-2) notation, which is used in computing. However, in decimal (base-10) notation commonly used by people, there are 1024 kilobytes in one gigabyte. This difference arises from the fact that in base-2, each place value is a power of 2 (2^0, 2^1, 2^2, etc.), while in base-10, each place value is a power of 10 (10^0, 10^1, 10^2, etc.). The base-2 value of 1024 kilobytes is then rounded to 1000000 for simplicity in some cases.