Class notes ECONOMIC250math

SpecificObjectives Bytheendofthetopicthelearnershouldbeableto: a.)Identify,readandwritenaturalnumbersinsymbolsandwords; b.)Roundoffnumberstothenearesttens,hundreds,thousands,millionsandbillions; c.)Classifynaturalnumbersaseven,oddorprime; d.)Solvewordproblemsinvolvingnaturalnumbers. Content a.)Placevaluesofnumbers b.)Roundingoffnumberstothenearesttens,hundreds,thousands,millionsandbillions c.)Oddnumbers d.)Evennumbers e.)Primenumbers f.)Wordproblemsinvolvingnaturalnumbers Introduction Placevalue Adigithaveadifferentvalueinanumberbecauseofitspositioninanumber.Thepositionofadigitina numberiscalleditsplacevalue. Totalvalue Thisistheproductofthedigitanditsplacevalue. Example Number Hundred Millions Ten Millions Millions Hundred Thousands Ten Thousands Thousands Hundred Tens ones 345,678,901 3 4 5 6 7 8 9 0 1 Novels,UpdatedCPA,CIFA,KASNEB,ICT,College,HighSchool&PrimaryNotes 769,301,854 7 6 9 3 0 1 8 5 4 902,350,409 9 0 2 3 5 0 4 0 9 Aplacevaluechartcanbeusedtoidentifybothplacevalueand totalvalueofadigitinanumber.Theplace valuechartisalsousedinwritingnumbersinwords. Example  Threehundredandfortyfivemillion,sixhundredandseventyeightthousand,ninehundredandone.  Sevenhundredandsixtyninemillion,Threehundredandonethousand,eighthundredandfiftyfour. Billions Abillionisonethousandsmillion,writtenas1,000,000,000.Therearetenplacesinabillion. Example Whatistheplacevalueandtotalvalueofthedigitsbelow? a.)47,397,263,402(placevalue7and8). b.)389,410,000,245(place3and9