Unit 3, Lesson 7
Center Day 1 (Optional)
Grade 2
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None
The purpose of this Number Talk is to elicit the ways students look for to use the structure of two-digit numbers to subtract (MP7). These understandings help students develop fluency and will be helpful later in this lesson when students will need to be able to find the difference between the estimate and actual measurement of an object.
Find the value of each expression mentally.
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To Gather
Materials from previous centers
The purpose of this activity is for students to choose from activities that focus on addition and subtraction within 100 or story problems. Students choose from previously introduced stages of these centers:
Choose a center.
Number Puzzles
Math Stories
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