ThisbecomesclearwhenwelookathowChildrenlearntounderstand a number, sayeight, notthesymboleight, buttheideaofthequantityofeighttointernalizethisseeminglysimpleidea, Childrenneed a lotofpracticeintwoskills.
Whilemostadultswhoseethefullpicturefindthisquestionodd, a fiveyearoldtypicallyjustanswersMAWRdogswhenyouaskfurthermoredogsthanwhatthechildrepliesthancats.
Weknow, forexample, that 11 yearoldunschooledstreetvendorsareoftenhighlyproficientincomplexmoneytransactionsbutincapableofdoingpaperandpencilarithmetic.