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    $\begingroup$ Thank you very much! But, next scholar year, my son will indeed work with negative numbers:-)! $\endgroup$ Commented May 12, 2015 at 8:40
  • $\begingroup$ Kuba: certainly this method can be adapted for negative numbers; would you like me to edit your post to do that or include it in my own? $\endgroup$ Commented May 12, 2015 at 9:40
  • $\begingroup$ @Mr.Wizard sure if you want and have an idea, without clear specification I would waste half of a day thinking if + (-10) or -10 and similar things. $\endgroup$ Commented May 12, 2015 at 9:47
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    $\begingroup$ I added a simple method. Hopefully it works well enough to meet with your approval. $\endgroup$ Commented May 12, 2015 at 9:56
  • $\begingroup$ @Mr.Wizard Thank you :) $\endgroup$ Commented May 12, 2015 at 9:57