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The purpose of this Number Talk is to elicit the ways students use their understanding of the properties of operations and the structure of whole numbers to add within 20 (MP7). Each expression is designed to encourage students to look for ways to make a ten by looking for two addends they know make a ten or by decomposing one addend to make a ten with another. The ability to find ways to make a ten will help students develop fluency within 20 and will be helpful later in this lesson and in upcoming lessons when students add and subtract within 20.
Find the value of each sum mentally.
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