Objective: Use tape diagrams as representations to solve put together/take apart with total unknown and add to with result unknown word problems.
In Lesson 19, students are presented with put together/take apart with total unknown and add to with result unknown word problems within 20 (1.OA.1). As they solve, they draw and box the two parts, and then include the numeral label within the box, producing tape diagrams. This enables them to quickly identify where the quantity can be found within the drawing.
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