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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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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