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The purpose of this Number Talk is to elicit strategies and understandings students have for adding by place and composing a ten mentally. These understandings help students develop fluency and will be helpful later in this lesson when students describe base-ten representations by place and use the fewest number of base-ten blocks to represent a number.
Encuentra mentalmente el valor de cada expresión.
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Clasifiquen los bloques.
Tenemos _________ centenas.
Tenemos _________ decenas.
Tenemos _________ unidades.
Representen el mismo valor total. Usen el menor número posible de bloques.
Tenemos _________ centenas.
Tenemos _________ decenas.
Tenemos _________ unidades.