The purpose of this activity is for students to solve Add To and Take From problems in the context of money. Students determine how much money each person has and how much money each person will have left after buying school supplies. The choice of coins in each problem invites students to consider both concrete and abstract methods for finding the amount of money left after each purchase. For example, students may consider which coins they could remove from the group of coins to purchase the items in each problem, or they may simply subtract the price of the item from the total value of the coins (MP2). In the Activity Synthesis, students discuss the different methods they used for finding how much money was left.

• Invite previously identified students to share how they crossed out coins to see how much was left.
• “What did _____ do to solve the problem?”
• Invite previously identified students to share the equations they wrote to solve the problem.
• “What did _____ do to represent their thinking?”
• “When did you use addition in the problems? When did you subtract? Why?” (To find out how much money, I added. To buy something, I had to subtract.)

The purpose of this activity is for students to solve two-step story problems, in the context of money, using addition and subtraction. In this activity, each student starts with $1 and buys multiple items. Students need to think about $1 as 100¢ in order to solve each problem. Students may use any method that makes sense to them to solve each problem. This could include drawing coins or writing equations. Some students may observe that Andre is buying the two items that Clare bought, and use their previous calculation to help solve this problem.

• Invite previously identified students to share how they determined if Andre had enough money.
• As time permits, invite students to share the ways they used to find how much money Clare and Tyler had left.