The purpose of this activity is for students to solve story problems involving dollar amounts. Students also think about what to consider when deciding whether or not to spend money on something.

• “¿Qué pasa si Han juega el juego? ¿Qué pasa si no lo hace? ¿Creen que Han debería jugarlo?” // “What will happen if Han plays the game? What will happen if he doesn’t? Do you think he should play the game?” (If he plays the game, he will have only \$9 left for the aquarium on Sunday. If he doesn’t play the game, he will have \$17 left for the aquarium. I think he should play the game, because he shouldn't need that much money at the aquarium. I don't think he should play the game, because he will spend too much on Saturday and might not have enough for Sunday.)

The purpose of this activity is for students to plan how they might spend their own money at a fair. Students first consider what amount of money makes sense to bring to a fair. They then look at price charts and record how they would spend their money. They can decide whether they want to spend all of their money, or just some of it. Students calculate how much they are spending and how much money they have left, as they make sure they have enough money for everything they plan to buy. In the Lesson Synthesis, students discuss what influenced their decisions about spending their money. When students consider assumptions about information not given in a situation and model a situation, using a representation such as a drawing or equation, they model with mathematics (MP4).

• “¿De qué cosas se dieron cuenta en su recorrido por el salón?” // “What did you notice on the Gallery Walk?” (Some people spent a lot of money, and some people didn’t. Some people spent all of their money on rides. Some people brought a lot of money but didn’t spend it all.)