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MAGYAR URALKODÓK IDŐRENDJE ÉS ARCKÉPCSARNOKA, A MAGYAR TÖRTÉNELEM IDŐRENDJE - A magyar királyok uralkodási rendje, a magyar történelem időrendje, erdélyi fejedelmek. - Keresd:Lehoczky József:MAGYAR LOVAGKÖNYV, A FEUDALIZMUS KÉZIKÖNYVE!
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directed number arithmetic sped up
the rules for combining directed numbers with addition and subtraction are probably too burdensome for memory so some awareness needs to be cultivated, over time some good graphics have been prepared by Shana McKay here and dropbox versions here many thanks to her once some facility with negative number additions and subtractions has been attained, it is desirable to move towards automating (i.e. no need to think too much) these skills this is an important step in the mathematics curriculum…