Write 2 ways in which whole numbers and decimal numbers are different
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To write 0.092 in words, you would say "zero point zero nine two." This is because the zero before the decimal point indicates there are no whole numbers, the decimal point separates the whole numbers from the decimal numbers, and each digit after the decimal point is read individually.
To write 213 as a decimal, you simply write it as 213.0. This is because whole numbers can be represented as decimals by adding a decimal point and a zero after the number. Therefore, 213 as a decimal is 213.0.
The main difference is that with whole numbers the decimal point is "hiding" (after the last digit of each whole number) whereas with decimal numbers it is clearly visible. In both cases the numbers are added with the decimal points aligned - with whole numbers there are no digits after the decimal points so the decimal points are not written, but if they were they would be visible after the last digit of the whole numbers and they would be automatically aligned; with decimal numbers there may be a different number of digits after each decimal point so it is up to the person doing the arithmetic to ensure the decimal points are aligned.
Decimals are used to describe parts of a number, something in between two whole numbers. Tenths, halves, eights etc. But 108 is only whole numbers, so there's nothing there to use a decimal for.
You can't change a whole number to a decimal. A decimal and a whole number are both numbers. A decimal is just a number lower than a whole number, or a number in between two whole numbers.