6 - 8 notes in an octave
8 - 6 is half a dozen
9 - 7 colors in a rainbow
11 4 sides and corners in a square
13 - 2 poles of a magnet
14 25 persent is 1 quarter
17 - nothing can be divided by 0
18 - seconds in a half minute
19 - 5 rings on the olympic flag