2.OA.3.+Determine+whether+a+group+of+...

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Operations and Algebraic Thinking 2.OA 3. Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
 * Work with equal groups of objects to gain foundations for multiplication. **


 * __Combining and Comparing__: Close to 100 (Investigation 1:1 - 2)[[file:close to 100.pdf]]


 * __Putting Together and Taking Apart:__ Working within 100 (Investigation 2:1-4)


 * __Putting Together and Taking Apart:__ Capture 5 (Investigation 5:2 - 3)[[file:capture.pdf]]


 * John Van de Walle and LouAnn Loving __Teaching Student-Centered Mathematics,__ __K-3:__ Pgs. 65 - 76; 94 - 111; 157 -185


 * __Origo:__ Addition/Subtraction; Fluency Kits; Mathementals 2; Think Tanks


 * __Bridges in Mathematics__


 * //Think Math//** Lessons 7.2; 11.7