an exact decimal must be with the number 0. in it or it is not exact.
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To change any percent into a decimal, multiply the percent by 0.01 (exact); therefore 83 percent = 0.83
The exact value of giga, in the context of metric prefices is 10^9 = 1,000,000,000 (1 billion). In the context of computer technology, it is 2^30 = 1,073,741,824.
It is impossible to express 8/17 as an exact decimal as it has 16 digits that recur: 8/17 = 0.47058823529411764705882352941176...
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. It may or may not contain a fractional part. If not, the decimal representation does not require a decimal point. So the decimal for 1 mega is 1 mega. If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
Because - Hex is an exact multiple of binary - whereas decimal numbers need to be converted from base 10 to base 2.