there are 100 centimeters in 1 meter, so 54 centimeters subtracted from 100 centimeters(1 meter) is
100-54=46
so 46 centimeters remain, or 46/100 of the board which is really 23/50 of the board.
So basically, your possible answers:
46 centimeters
0.46 meters
46% of the original board
23/50 of the original board
