5 will be sufficient.
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3.25 million is written in numbers as 3,250,000. This is done by placing the numeral 3 followed by a decimal point and the digits 25, then adding six zeros to represent the millions.
We have ten fingers (including thumbs) and early counting is based on one-to-one mapping onto these digits. So one reason is simple familiarity. The other advantage of counting in decimals is that fewer digits are required: 4 decimal digits takes you to over a thousand, you would need 10 binary digits to go over 1024. It gets worse with larger numbers: 7 decimal digits to go over a million but 20 binary digit. I have phones with 11 digit numbers (without the international country code). In binary, that would be a 33-digit number. No thanks!
If the two decimal numbers have x and y digits after the decimal points, then the product has (x + y) digits after the decimal point.
-- The decimal system (base-10) uses 10 digits to write all numbers. -- The binary system (base-2) uses 2 digits to write all numbers.
To write out a certain number of millions, move the decimal point six positions to the right. If there are not enough digits, fill out with zeros.