EXT K-2 Sampler

19 ExplicitHandsOn Instruction BaseTenBlocksPattern Objective4, 11: To explorebase tenblocks. Todevelop anunderstanding that 10oneshave the same value as 1 ten. PD Materials: Base tenblocks (ones and tens), 6-sideddice Vocabulary: ones place, tens place IntroducingBaseTenBlocks Eachpair or small group shouldhave at least 25ones blocks and10 tens blocks. Wearegoing tobeginusing base tenblocks. Seewhat you candiscoverabout your blocks.Theseblocks arevery importantbecauseof the patternused tomake them. Write2 columns on theboard: SAME DIFFERENT Explorewithyourblocks and talk toyourpartner aboutways theblocks arealikeor the same.What isone way theblocks are the same? (e.g., samematerial) Write the answerunder theword “same”on theboard. Now findotherways theyarealike. After aperiodof exploratory time, askhow theblocks are alike. (smooth, have8points, 6 sides, slide, stack, same color, solids, all madeof little cubes)At first, someof the studentsmay think theblocks are allmadeof squares; explain that there are squares on the sides of theblocks, but they are actually madeupof cubes. Askhow theblocks aredifferent. (different size, length, weight) Howmanydifferent sizesdoyouhave? (2) Canyouput 1of each size in front of you?We call the smallestblock the“ones”or “units”block.What is the relationshiporpatternbetween theonesblockand the otherblock? (It takes 10ones blocks tomake thenext block.) Wewill name thenext sizeof block the“tens” or “long”block. What is the importantpattern inournumber system? (It always takes 10of oneblock to equal 1of thenext largest block.) Read the example together.Have studentsusebase ten blocks to show that 10ones linedup are the same as 1 ten as they say, “10ones is the same as 1 ten.” Lookatproblem1.Match1block toeachpictureof ablock.Doyouhave10ormore than10blocks? (more than10) Trade10ones for1 ten.Whatblocksdoyou havenow? (1 ten and3ones) Circlegroupsof 10blocks onyourpage.Howmanygroupsof 10? (1) Trace the1 in theblankabove theword“tens.”Howmany leftoverones blocks are there? (3) Trace the3 in theblankabove the word“ones.”What is anothername for1 ten3ones? (13) Trace13 in theblankbelow theothernumbers. Have students complete thepage.Workcloselywith the students identifiedas theweakest students, asking them to tell youwhat theyaredoing toensure theyunderstand the key idea. Toss to 10 Eachpair shouldhave a6-sideddie, 20ones blocks andone tens block. The blocks areplacedbetween theplayers. Eachplayer throws thedie, takes the number of ones shownon thedie, andplaces themnext to the tens block. Thewinner is the first playerwhowins the tens blockby throwing anumber that adds exactly to10. Aplayerwith9onesmust toss a “1” toget 10 exactly; if he throws anything else, he loseshis turn. This important gamedevelops the concept that 10ones are the same as 1 ten. Journal Prompt Usepictures andwords to tell three things youdiscovered about base tenblocks.Use the words “same” and “different” inyour answer. 4 ©Math TeachersPress, Inc.,Reproduction by anymeans is strictly prohibited. 1. 2. 3. Circle groups of ten. Write the numeral in the blanks. _________ _____ _ __ tens ones __ ___ ____ _________ _________ tens ones _________ _________ _________ tens ones _________ Tens andOnes 10 ones are the same as… … 1 ten. 1 5 15 1 0 10 Lesson 2, 2ETeacherGuide 4 1.NBT.2b Step5 Concrete Representational Abstract