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The purpose of this Number Talk is to elicit the strategies and understandings that students have for adding three 1-digit numbers within 20. When students look for ways to decompose addends to make a ten with another addend, and add the remaining addends to find the sum, they look for and make use of the structure of numbers and properties of operations (MP7).
Find the value of each expression mentally.
None
The purpose of this activity is for students to choose from activities that offer practice adding and subtracting or working with shapes. Students choose from previously introduced stages of these centers:
Choose a center.
Picture Books
How Are They the Same?
Capture Squares