Objective: Solve take from with result unknown math stories with math drawings, true number sentences and statements, using horizontal marks to cross off what is taken away.
Lesson 28 begins with students solving action-based take from with result unknown problems, as they start with a set of objects, then take some away, and finally end with a smaller set of objects. Students then work with simple math drawings and equations to represent these take from with result unknown stories and connect the act of crossing off to the symbol for subtraction.
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