Unit 1, Lesson 3
Add 1 or 2
Grade 1
Preparation
Lesson Narrative
This lesson builds on the understanding developed in kindergarten that each successive number name refers to a quantity that is 1 more. Students relate addition to counting and see that adding 1 or 2 more is the same as counting 1 or 2 more (MP8). This deepens students’ understanding of the structure of the counting sequence (MP7).
Center choice time is introduced for the first time in this grade in this lesson. Students choose the activities they would like to do from previously introduced stages of centers. Although there are four centers to choose from in this lesson, not all centers need to be offered at this time. This is an opportunity to introduce classroom structures that will be used during center time throughout the year.
Math Community
Tell students that, at the end of the lesson, they will be asked to identify specific actions from their “Doing Math” list that they personally experienced.
- Engagement
- MLR7
- Find the value of sums within 10 when one addend is 1 or 2.
- Let’s add 1 or 2.
Required Materials
Activity 1
Required Preparation
- Each group of 2 needs a set of Number Cards 0–10.
- Each group of 2 students needs 25 two-color counters.
- Gather materials from previous centers:
- Counting Collections, Stage 1
- Number Race, Stage 3
- Check it Off, Stage 1
- Five in a Row: Addition and Subtraction, Stage 1
Suggested Centers
NoneTeacher Reflection Questions
Reflect on whether or not you were able to circulate and hear students discussing their thinking while they worked in centers. If you were, what routines or structures helped students work independently? If you were not, what routines or structures can you establish to ensure that you are able to circulate and talk to students as they work?