EXT K-2 Sampler

9 RTI Explicit InstructionUsingC–R–A Adding2-DigitNumbers Lessonsmove students through the3 stagesof learning: Concrete–Representational–Abstract 30 ©MathTeachersPress, Inc.,Reproduction by anymeans is strictly prohibited. You have 24 peanuts. Your friend has 35 peanuts. Howmany peanuts do you have altogether? Tens Ones Tens Ones 1 4 3 7 + 3 3 + 4 2 Tens Ones 2 4 + 3 5 Tens Ones Use blocks to add. Adding 2-Digit Numbers 1. 2. 3. 33 82 28 13 + 35 + 16 + 51 + 50 4. 53 40 21 36 + 46 + 27 + 78 + 21 5. Gina sold 25 boxes of cookies. Her friend sold 32 boxes. How many boxes did they both sell? _________ 6. Vang baked 24 peanut butter cookies and 12 sugar cookies. Howmany cookies did he bake? _________ ________ peanuts 5 9 9 7 7 4 68 98 79 63 57 99 67 99 seikooc 63 sexob 75 30 Objective32: Tousebase tenblocks to solve addition of 2-digit numbers, no regrouping. To nd apattern for adding2-digit numbers. Materials: PlaceValueMat (Master 10), base tenblocks Two-Digit Addition Each student or small group shouldhave aPlaceValue Mat andbase tenblocks. Today Iwill tell you some stories. Focuson the questionand theneeded facts. A er each story, Iwill askyou to retell the story to yourpartner. en, usebase tenblockson thePlace ValueMat to solve theproblem. Story1: Youhave34peanuts. Your friendhas 42peanuts.Howmanypeanutsdoyouhave altogether? What is theaction in thisproblem? (puttingnumbers together) Build34onyourmat.Build42onyourmat. Put together theones. Put together the tens.Howmany inall? (76) A er students read the answer from theblocks on themat, ask them to record theproblemwithpaper and pencil.Have avolunteer showhowheor she recorded theproblem. Story2: Youhave47peanuts. Your friendhas 22 peanuts. epeanuts cost 5¢ abag.Howmanypeanuts in all? ( is problemhas an extra fact.) Story3: Youhave28peanuts. Your friendhasmore peanuts thanyouhave.Howmanypeanuts in all? ( is is an exampleof aproblem that doesnot have enough information.) Story4: You sold28hot dogs onMonday. You sold 51hot dogs onTuesday.Howmanyhot dogsdidyou sell onMonday andTuesday? Record solutions for each storyon theboard. What is thepattern that tells youhow toadd two2-digitnumbers? Have students share theirpatterns anduse anypattern thatworks. (First, I added together thedigits in theones place. en I added thedigits in the tens place together. en Iwrote the answer from theblocks.) Tens Ones First build 34, then build42. Tens Ones Then put like blocks together. Read the example at the topof thepage.Usebase ten blocks on aPlaceValueMat todemonstrate thenumbers being added. Explain that this page shows apattern that maybeused to solve theproblem. Whatpattern isused to solve theproblem? (Add theones, then add the tens.) FamilyMath:AdditionBingo Skill Builders 32-3maybe sent home as a familymath activity. Skill Builders 32-1, 32-4 2ETeacherGuide 2.OA.1, 2.NBT.5, 2.NBT.6, 2.NBT.9 Tier 3 Tier 2 Tier 1 CCSSobjectives, TEKSobjectivesonTEKSeditions Concrete Representational Abstract 3