Reflection: Backwards Planning Subtract with 0, 1, and 2 - Section 3: Independent Practice


My students noticed something during our Bingo game that I did not plan for when the lesson was designed.  I designed the Bingo sheets to allow for answers to subtracting with 0, 1, and 2 from numbers ten and below. I have taught many lessons for my students to develop strategies to solve addition and subtraction, such as Adding with 0, 1, 2, Addition Doubles, and Think addition to solve subtraction and Subtracting with 0, 1, 2.

However, I have never taken the time to point out to my kids that many problems result in the same answer.  I believe because of their developmental stages (many are still within the concrete thinking stage), it came as a shock to many of them that I could call out a problem and they had already covered the answer for another problem stated. Many of them were surprised to see they got the same answer from different problems, such as 5-3=2 and 2-0=2. I had to stop and take a step backward to make the connection for them; you can watch the video in the resource section to see this. I had many students becoming upset because they believed they had done something wrong since answers were already covered for new equations that were being called out.

To avoid confusion, you might want to address this before the game begins.

  Backwards Planning: Confusion
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Subtract with 0, 1, and 2

Unit 11: Subtraction Strategies
Lesson 1 of 7

Objective: SWBAT subtract 0, 1, and 2 from numbers within 20 with fluency.

Big Idea: No solving required! Children need automaticity with subtraction problems within 20. We start to build fluency by learning the identity property and getting automatic with simple subtracting 0, 1, and 2 problems.

  Print Lesson
Math, Number Sense and Operations, facts, fluency, subtraction, take away, Operations
  45 minutes
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