The purpose of this lesson is for students to subtract 1 or 2 within 10.
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 one or two less, or counting back one or two, they are observing an important structure of the count sequence (MP7, MP8).
Tell students that, at the end of the lesson, they will be asked to identify specific actions from their “Doing Math” list (both teacher and student sections) they personally experienced during the lesson today.
- Subtract within 10, given expressions in which 1 or 2 is subtracted, in a way that makes sense to them.
- Let’s subtract 1 or 2.
Each group of 2 needs a set of number cards 0–10.
Each group of 2 needs a Five in a Row game board from the previous lesson.
- Counting Collections, Stage 1
- Number Race, Stage 3
- Check it Off, Stage 1
- Five in a Row: Addition and Subtraction, Stages 1 and 2
|Activity 1||20 min|
|Activity 2||20 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
What strategy did most students use in their work today? What surprised you about student thinking?
Print Formatted Materials
For access, consult one of our IM Certified Partners.