Oh, dude, -18 as a decimal is -18.0. It's like regular 18, but with a negative sign in front of it. So, yeah, that's it.
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18/20 in decimal form = 0.9
Expressed as a decimal, 9/18 is equal to 0.5.
18 hundredths as a decimal is 0.18, and as a fraction is 18/100, or 9/50 reduced.
54
0.018-move the decimal to places to the left