1 million < 165 so 6 digits would be enough.
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0xff = 16 x 15 + 15 = 255 The letters A-F are used to represent the decimal numbers 10-15 (respectively) which are required to be held in one hexadecimal digit.
To write 3.5 million in numbers, you would represent it as 3,500,000. This is because the number 3 represents the whole number part, and the decimal point is followed by the fractional part, which is represented by 5. The million indicates that the number is in the millions place value, so it is written as 3,500,000.
2.25 million in numbers is written as 2,250,000. This is the standard numerical representation of the value 2.25 million, where the decimal point separates the whole number part (2) from the decimal part (0.25), and the term "million" indicates the scale of the number.
That refers to a system to represent numbers. For example, the decimal system we use in most of the world.
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. A decimal representation does not require a decimal point. So the required decimal representation is 8100, exactly as in the question.