3 radical 5
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16/45 cannot be simplified.
64/45 is in its simplest form.
45/56 cannot be simplified.
2/45 is already in its simplest form
You probably mean what is the simplest form of sqrt 45....? 45=3x3x5 3x3 is a square number, so sqrt45=sqrt(9*5)=sqrt(9)*sqrt(5)=3*sqrt(5) * indicates multiplication sqrt indicates a square root (also known as a surd (in the english national curriculum) or a radical...apparently