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The purpose of this Number Talk is to elicit strategies and understandings students have for adding and subtracting multi-digit numbers. These understandings help students develop fluency and will be helpful in later units as students add and subtract multi-digit numbers fluently using the standard algorithm.
When students make adjustments and create multiples of 10 for mental addition, they are looking for and making use of the base-ten structure of numbers (MP7).
Encuentra mentalmente el valor de cada expresión.
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El “li” es una unidad de longitud tradicional en China y en algunos países del este de Asia.
Estas son las distancias que camina un estudiante en China entre su casa y algunos de los lugares que visita con frecuencia.
Cuál queda a menor distancia de la casa del estudiante:
Un estudiante en los Estados Unidos camina
¿Cuál estudiante camina una mayor distancia a la escuela? Usa las rectas numéricas para mostrar tu razonamiento.
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