To convert a decimal to a fraction, write it as a decimal fraction. Hence
0.8 / 1.0
Notice we write it over 1.0.
We always write it over '1 point' and since the decimal is to only one decimal place we only write in one zero.
Hence 0.8 / 1.0
Cancel down the decimal point, hence
08/10
Ignore the prefixed zero' to the '8'.
Hence 8/10
Since both '8' and '10' are even numbers we can cancel down by '2'
Hence
8/10 = 4/5
This will not cancel any further as '5' is a Prime number.
It follows that 0.8 = 4/5
NB If the decimal is to two/three decimal places then you write in 'two/three' zeroes.
e.g.
0.88 = 0.88/1.00 or 0.888 = 0.888 / 1.000
And then proceed as above.
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4.5 * * * * * No, it is not. 08 is an integer and its simplest form is 8/1 0.8 = 8/10 = 4/5
Look at the decimal places. The first one after the decimal point is the tenths place, which means you can read .08 as eight tenths. So .08 = 8/10. Then you can reduce 8/10 to 4/5
100+ 08
It is not clear why 08 has a preceding 0: is it meant to be 0.8 or .08? Also, what is meant by "g mL" after 08: is it meant to be just mL or g/mL? "g mL" is not a sensible measurement unit.
.8 = 10 times .08 . .08 is one-tenth of .8 .