Howard cuts 80 centimeters off a 1.5-meter board. how much of the board does howard have left?

80 centimeters off a 1.5 meter board. How much of the board does Howard have left

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.