EXT 3-6 Sampler

36 Grade3 Multiplication&AdditionRelationship 25 ©Math TeachersPress, Inc.,Reproduction by anymeans is strictly prohibited. Multiplication andAdditionRelationship 2. 2+ 2+2=__________ 3 groups of 2= ________and 3 2= 3. 5+ 5+ 5=________ 3groups of 5= ________ and3 5= 4. 1groupof 5= ________and1 5= 5. 0groups of 5= ________ and0 5= 2 + 2 + 2 + 2 + 2 = 10 5groups of 2= 5 2 = 10 1. 5 + ________+ ________+________= 4groups of 5= ________ and4 5= The answer in amultiplication problem is called the product. The numbers beingmultiplied are called factors. Multiplicationputs togethergroups of thesamesize.Multiplication is reallyashortcut foraddition. 6. What doesmultiplicationmean? _________________________________________ ____________________________________________________________________ 5 5 20 20 20 6 6 15 15 5 0 Multiplicationmeansputting together groupsof the same size. 5 0 15 6 5 25 Objective20, 24: To introducemultiplication as repeated addition and as a shortcut for addition. Tomultiply by2 and5. PD Materials: Paper, crayons, tape Vocabulary: multiplication, times sign ( ), product, factors Read toMe: Arctic FivesArrive, Pinczes, Elinor J. (See related activity on foreword p. xiii.) AddingPairs of Shoes Introducemultiplicationby2byhaving students put togetherpairs of shoes.Name9 students, ask eachone to writehis orhernameon a sheet of paper, and thenhave each studentworkwith apartner toplace apair of shoes on thepaper andoutline them. Holdup apaper as you ask, Howmany shoes areon thispaper? (2)Tape thepaper to theboard.Name a second student, again asking, Howmany shoes areon thepaper? Howmany shoesdo these2 studentshave inall? (4) Repeat until youhave counted theoutlined shoes of 9 students. Howmany studentshave shoeson these sheets ofpaper? (9) Howmany shoes inall? (18) Howdidyou get youranswer? Studentsmight count the shoes oneby oneor skip count by twos. Writeon theboard: Here is anotherway to show the sameproblem.How many shoes areoneach sheet ofpaper? (2) Howmany studentsput 2 shoesonapaper? (9) Howmany shoes in all? (18)Writeon theboard: 2 9 18 product This is a storyabout a“2”anda“9” thatbecome18. Weareusinga special kindof addition.What is special about this addition? (Weput the samenumber together over andover.) The sign thatmeansputting together groupsof the same size is called the times signor the multiplication sign. Write amultiplication sign in the problemon theboard. Weareputting together2 shoes 9 times. Theanswer inamultiplicationproblem is called the product.Thenumbersbeingmultipliedare called factors. CountingGroups of Five Each student shouldhave crayons andpaper. Repeat the activitybyhaving each student outline1hand.Holdup1 picture and tape it on thewall. Howmany fingerson this hand? (5)Holdup anotherpicture and tape it to thewall. Howmany fingerson thishand? (5) Howmanyhandson thewall? (2) Howmany fingers inall? (10) Repeat until 4pictures of 5hands aremountedon the wall. Writeanaddition sentenceandamultiplication sentenceabout thisproblem. Whatdoesmultiplicationmean? (multiplicationmeans putting together groups of the same size) Read through the example at the topof thepage.Work problem1 together, thenhave students finish thepage independently. Thinkof thepicturesof shoesorhands to answer thequestions. Discuss problems 4 and5. When youmultiplyanumberby1, theanswer is the sameas the numberbeingmultiplied.Whenyoumultiplyby0, the answer is always0. Journal Prompt Multiplication is a shortcut for addition.Use words, diagrams, and/orpictures to explain if you agreeordisagreewith this statement. Skill Builders 20-1, 24-1 and4 x 5=20 5 x 4 5+ 5 +5+5 = 20 Lesson8, 3ETeacherGuide 3.OA.1, 3.OA.4, 3.OA.5, 3.OA.7 Journal Prompts encourage students to usewords andpictures toprepare for Smarter BalancedandPARCC Assessments. Studentsdraw picturesof their hands and shoes to understand multiplication as a short cut for addition. Objectives for CCSS, CCSS-CA, andTEKSnoted on lessonplans in respectiveTeacherManuals.