Yes, to 45/2 or 22 and 1/2
It is: 12/20 = 3/5 simplified
Yes.
It is 18/20 which can be simplified, if required.
2-9/20 can't be simplified any further.
0.45 kg
11/20, as a fraction cannot be simplified. It is equal to 0.55
450/1 is.
As a fraction, it is already simplified.
300/450 = 2/3
480/450 = 1 30/450 =1 1/15
16
It is 5/450, which can be simplified, if required.