0.5 is already in the form of a decimal fraction.
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.05
0.05 or just .05 is five hundredths as a decimal.
0.5
40 as a decimal would just be 40.0
To write 47 units in decimal form, you simply write "47.0". This is because the decimal form of a whole number is the number followed by a decimal point and a zero. In this case, the whole number 47 is written as 47.0 in decimal form.