Objective: Relate subtraction facts involving fives and doubles to corresponding decompositions.
In Lesson 35, students relate their knowledge of both doubles and fives to the context of subtraction, where they extract those known facts from given expressions. For instance, when faced with 8 – 5, students access the decomposition of 8 (“I know that 5 and 3 makes 8.”) and apply that understanding to help them solve subtraction problems (“So, 8 – 5 must be 3.”).
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