Question 825762
It's simple :)
Just add the numbers from 1 to 9, then subtract the sum of the numbers the children got. You'll get the number which was not distributed. :)

{{{1+2+3+4+5+6+7+8+9=45}}}
{{{45-7-10-11-12=5}}}
{{{5}}}

You're actually correct :) You dont need to know what combination of numbers they got, :)


HOPE it helps!