Unit 1, Lesson 4
Más trabajo con 1 y 2
Grado 1
Preparation
Lesson Narrative
This builds on the previous lesson where students considered the number sequence to support them in adding 1 or 2. When students see that subtracting 1 or 2 from any number is the same as counting 1 or 2 less, or counting back 1 or 2, they are observing an important structure of the count sequence (MP7, MP8).
Math Community
Before the lesson, explain to students that norms are expectations that help everyone in the room feel safe, comfortable, and productive doing math together. Offer an example, such as: “It may help us share our ideas as a whole class if we have the norm ‘Listen as others share their ideas.’” Tell students to think about norms that help everyone do math as they work today, and that you will record these norms during the Lesson Synthesis.
- Representation
- MLR8
- Find the value of differences within 10 when 1 or 2 is subtracted.
- Restemos 1 o 2.
Required Materials
Activity 2
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:
- Counting Collections, Stage 1
- Number Race, Stage 3
- Check It Off, Stage 1
- Five in a Row: Addition and Subtraction, Stages 1 and 2
Suggested Centers
NoneTeacher Reflection Questions
What strategy did most students use in their work today? What surprised you about student thinking?