1st–2nd GradeObjective• Studentswillidentifyadditionandsubtractionfact
familiesto10.
Materials Needed• Unifix®Cubes(orotherlinkingcubes)• Whiteboardorchartpaper• Marker• FactFamilyWorkMat• Treetrunktemplate• Applestemplate• Basketstemplate• ConstructionPaper-9"x12"(brown,redandgreen)• ConstructionPaper-12"x18"(lightblue)• Scissors• Glue
PreparationReproducethetreetrunktemplateonbrownconstructionpaper,theapplestemplateonredconstructionpaper,andthebasketstemplateongreenconstructionpaper.Eachstudentneedsonetreetrunk,onesetoffourapples,andonebasket.
IntroductionIntroduceorreviewtheconceptoffactfamilieswithyourstudents.Tellstudentsthatunderstandingfactfamiliescanhelpthemrememberrelatedmathfacts.
Usethreelinkingcubestodemonstrateafactfamily.Say,“Ifyouknowthat1(holduponecube)+2(attachtheothertwocubes)=3,thenit’seasytorememberthat2+1=3(continuetodemonstratewiththecubes),that3–2=1,andthat3–1=2.They’reallrelated!”
Writethefourequationsontheboardorchartpapertoreinforcetheconcept.
Procedure 1. GiveeachstudentsevencubesandaFactFamilyWorkMat.
2. Write3+4ontheboardoronchartpaper.Askstudentstoplacethreelinkedcubesinthefirstcircleandfourlinkedcubesinthesecondcircleontheirmats.
3. Ask,“Whatdoes3+4equal?”
4. Invitestudentstosharetheiranswers.Thenwrite=7ontheboardtocompletetheequation.
5. Explainthatyouarenowgoingtoswitchthefirsttwonumbersintheequation.Beneaththefirstequation,write4+3.Askstudentstobuildthenewequationontheirmatsbyplacing4cubesinthefirstcircleand3inthesecondcircle.Invitestudentstosharetheiranswersandwrite=7ontheboard.
6. Discussthefactthatbothequationshavethesameanswer.
7. Write7–4ontheboard.Askstudentstoputsevenlinkedcubesinthefirstcircle.Thenaskthemtoremovefourcubes.Howmanyareleft?Add=3totheequationontheboard.
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Gabe
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8. Askstudentsiftheynoticeanythingaboutthenewequation.Discussthefactthat3and4togetherequal7,sowhenstudentstake4cubesfrom7,thereare3left.
9. Workwithstudentsinthesamewaytofindtheanswerto7–3.
10.Concludethelessonbyexplainingthatagroupofrelatedadditionandsubtractionproblemslikethisoneiscalledafactfamily.Ifstudentsknowoneofthefacts,theotherfactsinthefamilywillbeeasytorecall.
11.Ifnecessary,repeatthelessonwithdifferentfactfamiliesuntilstudentsunderstandtheconcept.Thengivestudentsthreenumbersthatmakeupafactfamily,andaskstudentstoworkinpairstofigureoutthefourequations.Askstudentstosharethefourequationswiththeclass.Writethemontheboardorchartpaper.
Independent Practice 1. Giveeachstudentatreetrunktemplateanda12"x18"sheetoflightblueconstructionpaper.Instruct
studentstocutoutthetrunkandglueittothelightbluepaper.
2. Inviteeachstudenttochooseabasketwithafactfamilyprintedonit.Havestudentsgluetheirbasketstothebottomsofthetreetrunks.
3. Giveeachstudentasetoffourapples.Promptthemtowritethefourequationsintheirfactfamilyontheapples.Thenhavestudentsgluetheapplestotheirtrees.
4. Displaythetreesonabulletinboardtitled“FallFactFamilyTrees!”
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