Reflection: Checks for Understanding Plus Ten Minus Ten - Section 4: Closing


I received a wide range of responses when I asked students what happens when they add 10 to a number. Several students said something like, "when I add 10 I just change the tens place." I also had several who said they just go up one on the number grid. Two children just wrote a number sentence  like 38 + 10 = 48. Others mentioned counting up 10. 

When I look at the different responses, I see that students are not all in the same place with their understanding, but each one has some sort of strategy for approaching the adding of 10 to a number. Some are still relying on counting while others are moving to a more mental math response to adding 10 to a number. There are still children who are counting up who need continued support with place value understanding.

  Student Responses
  Checks for Understanding: Student Responses
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Plus Ten Minus Ten

Unit 2: Adding and Subtracting the Basics
Lesson 11 of 18

Objective: SWBAT add ten to a single digit number without counting up and subtract 10 from a double digit number.

Big Idea: To help students develop fluency skills with adding and subtracting numbers within 100. A variety of strategies need to be presented to encourage students to think mathematically.

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