Objective: Solve add to with change unknown problems, relating varied addition and subtraction strategies.
Lesson 23 allows students to use counting on as it relates to subtraction, take from ten strategies, or the get to ten Level 3 strategy, as they solve add to with change unknown problems (1.OA.6). The get to ten strategy has students solving 12 – 3 as 12 – 2 – 1, understanding that decomposing the subtrahend to easily get to the ten yields a simpler, more manageable subtraction problem.
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