0.00025
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The number is in decimal notation.
This number already is a decimal.
To write 4.2 as a decimal, you simply write it as it is. The number 4.2 is already in decimal form. In decimal notation, the whole number part (4) is followed by a decimal point, then the fractional part (2) which represents two tenths. So, 4.2 is the decimal representation of the number four and two tenths.
To write twelve and three tenths as a decimal, write the number twelve as a whole number to the left of the decimal place and three tenths as three to the right of the decimal place. It appears as 12.3
To write 45000 in decimal form, you simply write the number as it is, without any decimal places. In decimal form, 45000 is written as 45000.