The purpose of this activity is for students to explain how a subtraction expression represents a story problem (MP2). Students connect the expression to the story problem and then solve the story problem. Students will be introduced to equations in a later unit.

• Write “.”
• “¿Qué representa el 10 en el problema-historia? ¿Qué representa el 6?” // “What does the 10 represent in the story problem? What does the 6 represent?”
• “Tengo 10 y quito 6, quedan 4. Podemos escribir eso como  es 4” // “10 take away 6 is 4. We can write that as is 4.”

The purpose of this activity is for students to choose expressions that represent story problems (MP2).

If students match the second story problem with an expression other than , consider asking:

• “¿Puedes contarme lo que ocurre en el problema-historia?” // “Can you tell me what is happening in the story problem?”
• “¿Se está agregando algo o se está quitando algo en el problema-historia? ¿Cómo te puede ayudar esto a descubrir cuál expresión le corresponde al problema historia?” // “Is something being added or taken away in the story problem? How can that help you figure out which expression matches the story problem?”

• Display and . If needed, reread the second story problem.
• “¿Cuál expresión escogieron? ¿Cómo supieron cuál expresión escoger?” // “Which expression did you choose? How did you know which expression to choose?” (. Some of the kids left, so I chose the one with the minus sign.)
• Display .
• “Usen esta expresión para contarle a su compañero lo que ocurrió en la historia” // “Use this expression to tell your partner what happened in the story.”

• Number Race
• Math Stories

• “De los problemas-historia que su compañero les contó, ¿cuál fue su favorito? ¿Por qué fue su favorito?” // “What was your favorite story problem that your partner told you? Why was it your favorite?”