EXT K-2 Sampler

49 Objective 26: Touse the order property. Materials: Interlocking cubes, Addition-Subtraction Mat (Master 3) Vocabulary: order property of addition ActingOut Stories Ask students to act out a classroomproblem. Example: Three students are at a door. One is at awindow. They come together at a desk. Record the number sentence and identify the number sentence as an addition fact. Then ask the students to change positions (1 at the door and 3 at thewindow) and come together at the desk. Record the facts. (3+ 1= 4, and 1+ 3= 4) How are these twoproblems alike? (they bothput together a 3 and a 1 andhave a sumof 4) How are these twoproblems different? (one problem starts with 3 and adds 1, the other problem startswith 1 and adds 3) Howdo the answers in these 2 problems compare? (answers are the same) Repeatwith several other examples. What doweknow about the answerswhenwe add2numbers in adifferent order? (You can add 2numbers in any order and the answer is the same.) This is called theorder propertyof addition. Models on theAddition-SubtractionMat Have students use theirAddition-Subtraction Mats and interlocking cubes tomodel the story about 3 students at a door and 1 student at awindow. What happens to the sum ifwe change the positionof the cubes? Demonstrate. (The answer stays the same.) What dowe know about adding the 2numbers indifferent orders? (You can add 2numbers in any order and the answer is the same.) Direct attention to the first problem. Have students read thewords, “3 apples, 2 apples. Howmany in all?Draw all.” Review thepartsof thenumber sentence. What does theplus signmean? ( putting together )What does the equal signmean? (Itmeans that the2 sides have the samevalue.) What does theword “sum” mean? (thenumber in all, or the answer in an additionproblem) Repeat the instructionswith the 2 apples and 3 apples on the right side.Have students complete the page on their own. Journal Prompt Write anumber sentence that describes the picture above. Nowwrite another number sentence that canbemade using these same numbers. Draw a picture of that number sentence. Skill Builders 26-4, 26-7, 26-8 11 ©Math TeachersPress, Inc.Reproduction by anymeans is strictly prohibited. Order Property Draw a line tomatch the sums. 3 + 0 = _______ 4 + 1 = _______ 1 + 4 = _______ 1 + 5 = _______ 0 + 2 = _______ 0 + 3 = _______ 5 + 1 = _______ 2 + 0 = _______ 3 apples 2 apples 2 apples 3 apples 3 + 2 = ______ 2 + 3 = ______ Howmany in all? Draw all. Howmany in all? Draw all. 4 + 2 = ______ 2 + 4 = ______ 4 nuts 2 nuts 2 nuts 4 nuts Howmany in all? Draw all. Howmany in all? Draw all. The sums are the _____________. The sums are the _____________. 5 5 6 6 2 3 6 5 6 2 5 3 same same Lesson 5, 1ETeacherGuide 11 1.OA.3, 1.OA.6, 1.NBT.4 OrderProperty Grade1