Multiple choice softskills creativity What number can you subtract half from to obtain a result that is zero? 6 9 8 3 Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is a visual riddle. If you 'subtract' (remove) the top half of the digit '8', you are left with a '0' (or two zeros). Mathematically, subtracting half of 8 (4) leaves 4, but the riddle relies on the shape of the numeral.