523 final presentation

8/3/2019 523 Final Presentation

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Moderator:Inviteclassmatestovirtualclassroomandpointoutelementsof

Elluminatethatclassmatesmayuseforaskingandansweringques:ons.Then,go

overthenext2slidesthatoutlineprerequisiteknowledgeforthislessonandthe

lessonobjec:ves.

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Moderator:ThislessonisdesignedforPre-Algebrastudentsthathavealready

learnedhowtofindpercentofincreaseandpercentofdecrease.(Thendescribethis

slideandthenextslide)

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Moderator:ItlookslikeeveryonehascheckedinexceptforMichelle.Letmegive

heraquickcall.Michelle?

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Shopperchecksin:(audio)Hey,Derrick!IknowIamsupposedtobeinclassonline

rightnow,butIjustpassedthemallandsawasignwithmyfavoritefour-leerword

S-A-L-E!YouKNOWIcantpassupthisopportunitytobuysomethingonsale,

evenifIdonthaveauseforitrightnow.Theress:llroominmyclosetBut,since

Ihadntplannedtostoptonight,Idonthavemycalculatortofigureoutthesale

prices.DoyouhaveoneIcanborrow?

Moderator:Sorry,Michelle,butIliveacrossthecountryfromyouontheeast

coast,sotheresnowayIcangetonetoyouin:me.

Shopper:ThenhowamIsupposedtoknowhowmuchthingscostnow?

Moderator:Goodques:on!Maybesomeofyourclassmateswillhaveanidea.Can

yougiveusanexampleofasaleitemyouareinterestedin?

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Shopper:Yeah.TheresthisgreatBoiseStatet-shirtthatwasoriginally$19.95,butis

onsaleat30%off.So,howmuchisitnow?

Moderator:Ithinkyourclassmatesmighthaveanideaaboutthis.Onthenext

slide,youwillselectachoiceofanswerstothisques:onfromthe3op:onslisted.

Usingthevirtualwhiteboard,pleaseenteryourini:alsinthecolumnunderwhatyouthinkisthecorrectsalepriceofthet-shirt.Ifyouarenotsurehowtofigurethisout,

giveityourbestguess.

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Moderator:Pleaseaddyourini:alsunderwhatyouthinkisthecorrectsaleprice.

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Moderator:Youknow,Michelleandclassmateswhileusingacalculatormayseem

easier,youdontneedonetofindasaleprice.Doyouknowhowtocalculatethe

priceinyourmindinstead?

Shopper:No.Theresawaytodothat?IthoughtIalwaysIneededtousea

calculator!

Moderator:Whyyes,thereis!But,letmeaskyouacoupleofques:onsfirst.

Shopper:Okay.Whatdoyouwannaknow?

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Moderator:Ifyouwenttothestoretobuyat-shirt,whatpercentageofthet-shirt

wouldyouwanttohave,andwhatpercentageofthepricewillyoupay?

Shopper:Well,Iwouldwantawholet-shirt,soIdwanta100%ofit.Howmuch

percentage?IfIboughtit,Idhavetopay100%oftheprice.

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Moderator:Right!So,ifthet-shirtisonsaleat30%off,areyouaddingor

subtrac:ng30%totheoriginal(100%)price?

Shopper:Itsasale,soIguessIwouldsubtract.

Moderator:Okay,classmates.Theques:onthenis,howmuchmoneydowesubtractfromtheoriginalprice?

Howdoyouknowifyouhavesubtracted30%?

Canyouthinkofastrategywhereusingpercentagesmightbehelpful?

Allow:mefordiscussion,usinghand-raising.Asclassmateshaveanideaonhowto

calculate.Discusstheapproaches.Encouragelearnerstofigureout10%,then

mul:plyby3,thensubtractthetotalfromtheoriginalprice.Noneedtobeexact,

unlesstherearedollarsandnocents.Closees:mates[within50cents]are

allowable.)

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Moderator:Whenyouwanttofind10%ofsomething,movethedecimalpointone

placetothele.

10%of$19.95=$1.995~$2.00

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Moderator:If10%is$2.00,then30%is3x$2,whichis$6.00.

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Moderator:Ifyoutake$6from~$20,youwillbepaying$14.

(Allow:meforsmalldiscussion,ifthereareques:ons.)

Moderator:Letslookbackatyourchoicesonthevirtualwhiteboard.Wasyour

answerclosetotheactualsaleprice?Ifso,giveyourselfahappyfaceLike.

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Shopper:Imgladtoknowthatprice,butIfoundanotheritemIwanttobuy.Itsa

newiPad2thatisnormally$829,butitisonsaleat%15off.HowdoIfigureTHAT

out?

Moderator:Thatsagoodques:on.Letsseeifyourclassmateshaveanyideashow

tofigurethatoutwithoutacalculator.Keepinmindthatyouaretaking10%and

another5%offfromthesameprice(Allow:meforsmalldiscussionorsomeonetoshowworkonthisslide.)

Moderator:Justforkicks,letscheckoutouranswerslidetoseeifanyoneisclose.

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Moderator:Ifyouaretaking15%offofanitem,youaretaking10%offandanother

5%off.Youknowhowtodeterminea10%,and5%isof10%,sowhateverthe10%

amountis,takeofitandaddittothe10%amount.Thensubtractthecombined

amountfromtheoriginalprice.

ExampleAniPad2isnormally$829,butisonsaleat15%off.

So,10%of$829.00is$82.90.If10%is$82.90,then5%isof$82.90.(Fores:ma:onandsimplifica:onpurposes,letsroundthe$82.90to$82.)

10%[$82]+5%[$41]=15%[$123].So,thesalepriceis$829-$123=$706.Whata

bargain!(assumingyoudecidedearliertopurchaseaniPad2andhavethe$706)

(Allow:meforshortdiscussionofanyques:ons.)

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Moderator:Tofindapercentageotherthan10%,mul:plythe10%bythatnumber.

Forexample(onslide)tofind40%,find10%,thenmul:plythe10%numberby4.

Anitemthatwas$89.99at40%offwouldbe

10%of$89.99is$8.999~$9.00,and40%offwouldbe$9x4=$36.

So,40%offof$89.99is~$90-$36=$54.Thesalepriceis$54.

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Shopper:Hey!IthinkIvegotthehangofthis!So,iftheoriginalpriceis$40anditis

30%off,Iknowthat10%of$40wouldbe$4,and$4x3=$12,tomake30%.So

$40-$12=$28.Ionlyhavetopay$28!

Moderator:Awesome!Youreright!

Classmates,its:metoprac:ce.Ashortquizwillbeshowinguponyourscreens.Pleasechoosethecorrectanswerforeachques:onandthenhitsubmit.Well

checkanswerstogethershortly.

(Allow:meforshortquizof5ques:ons.Aereveryonehasfinished,showresults.)

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Thisnextsec:onisonlyifthereiss:ll:meinthelesson.Skipdowntocon:nue

dialogueandfinish.

Moderator:Youhaveallbeenprac:cingashortformulainyourheadtocalculatea

percentageoffofasaleprice.Arethereanysitua:onsyoucanthinkofwhereyou

mightwanttoADDpercentages?

(Allow:meforresponses.Lookingforadding:psontoafoodcheck.)Moderator:ThesameformulaappliesforbothADDINGANDsubtrac:ng

percentages.Atarestaurant,ifthefoodpor:onofthecheckamountsto$14.91,

andyouwanttoadda20%:p,first,roundthecheckamountto$15tomakeiteasier

toworkwithinyourhead.Second,find10%of$15.00,whichis$1.50.If10%is

$1.50,then20%istwicethatamount,or$3.00.So,the:pamountis$3.00,addedto

thecheckof$14.91,totals$17.91.

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Moderator:So,Michelle.Howareyoudoingincalcula:ngyoursalespricesand

:ps?

Shopper:IthinkIhaveitallfiguredout.Ihaveoneproblem,though.

Moderator:Whatsthat?

Shopper:Iseemtohaverunoutofmoney.Howaboutaloan?

Moderator:IdontTHINKso,Michelle!

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Moderator:Wehavereachedtheendofourpresenta:on.Thankyouforyour

par:cipa:onthisevening.

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523 final presentation

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