It has apparently been shown, years ago and on a limited sample, that avoiding arithmetic until 7th grade (in favour of general discursive education) can produce good results in terms of the ease and success of eventual learning of arithmetic: <a href="http:&#x2F;&#x2F;www.inference.phy.cam.ac.uk&#x2F;sanjoy&#x2F;benezet&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.inference.phy.cam.ac.uk&#x2F;sanjoy&#x2F;benezet&#x2F;</a>