Objective: Solve put together/take apart with addend unknown word problems and relate counting on to the take from ten strategy.
Drawing on the momentum gained from Topic B, Lesson 22 allows students to attack put together/take apart with addend unknown word problems such as, “Maria has 15 baseballs, 8 of them are old, and some of them are brand new birthday presents. How many brand new baseballs does Maria have?” Students solve these problems using both the Level 2 counting on strategy and Level 3 subtraction strategies (1.OA.4).
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