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Math is not measurable in weeks.



England has a common curriculum so you can measure maths in months. http://en.m.wikipedia.org/wiki/National_Curriculum_(England,...


The only gripe I have is that they say the kids are using the apps for 30 minutes every day, for six weeks (presumably, that's 5630minutes, not 7630) -- but I don't know how much math kids that age get in school? Is it 45 minutes a day? Every other day?


In general about an hour each day, some days might be 45 minutes. It will vary from school to school and year to year I think.


Put spaces around your asterisks, to prevent their other interpretation in HN posts (i.e. markdown italic).


Thanks for pointing it out (for posterity, and new users) -- I really do know better, but I always forget, whenever I try to write some math in-line in a comment... now the edit-window for parent was closed.


Hacker news asterix strikes again, eats multiplication sign.

    5*6*30 minutes vs 7*6*30 ...




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