3+6=9 in base 10 (decimal) arithmetic. If you were in base-8 (octal) then 3 + 6 = 118. Where 118 still represents 'nine', though (it is 1 'eight' plus 1 'one')
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-3 -6 - -9 -6 = -6+9-6 = 3 - 6= -3
the fact family of the numbers 3, 6, and 18 is: 3 x 6 = 18; 6 x 3 = 18; 18 ÷ 3 = 6; 18 ÷ 6 = 3
1/3 + 3/6 = 2/6 + 3/6 = 5/6
3 + 6 + 9 = 18/3 = 6 The average of the three values is therefore 6.
5/6 - (3/1)/6 = 5/6 - 3/6 = 2/6 = 1/3