The purpose of this activity is for students to learn Stage 2 of the Target Numbers center. Students add tens or ones to get as close to 95 as possible. Students take turns picking a number card, deciding to add that number of tens or ones to their starting number for the round, and writing an equation. Students start their first equation at 25 and then the sum becomes the first addend in the next round. The player who gets closest to 95 in 6 rounds, without going over, is the winner.

• “When you draw the number card, what is your method for deciding whether to add that many tens or ones?” (I think about how close I am to 95. That helps me think about whether to add ones or tens.)

The purpose of this activity is for students to choose from activities that focus on adding within 100. Students choose from any of the previously introduced stages of the listed centers. They are encouraged to choose the center that will be most helpful for them at this time.

• Target Numbers
• Number Puzzles
• Five in a Row

• “What is one thing you learned or got better at by working on the activities you chose?”

The purpose of this activity is for students to experience different contexts in which someone adds a two-digit and a one-digit number. This helps students see math in their world. If necessary, the context of each problem can be changed to something more familiar to the students. This activity is optional because it provides practice solving story problems with numbers larger than 20, which is not an expectation of students in grade 1. 

When students create representations and expressions for the context, they develop ways to model the mathematics of a situation and strategies for making sense of and persevering to solve problems (MP1, MP4).

• Invite students to share the methods used for each problem. Record equations to match each method.