Reflection: Checks for Understanding Ways to Make 9- A Lesson on Decomposing - Section 3: Practice


During the small group lessons, the two most common errors I have seen are:

-Students not creating two separate groups with their manipulatives.  They use the manipulatives from the first group to create the second group.  (For example when reading a word problem such as "Jimmy has 2 cookies and Sammy has 4 cookies.  How many cookies do they have all together?"  I have some students who will put down 2 manipulatives and say there are Jimmy's cookies.   Then they count those and lay down two more as they say 3, 4 and say there are Sammy's cookies.)

-Students not counting all of the manipulatives to come up with a total.  They lay down the correct number of manipulatives and separate them into the two groups, but then only count one of the groups when solving the problem.


I have split the students into groups based on these errors so that we can focus on them during tomorrow's small group lesson.

  Most Common Errors
  Checks for Understanding: Most Common Errors
Loading resource...

Ways to Make 9- A Lesson on Decomposing

Unit 8: Addition
Lesson 16 of 21

Objective: Students will be able to decompose the number 9.

Big Idea: Students will learn what it means to represent a number in different ways and will begin to explore decomposing numbers.

  Print Lesson
3 teachers like this lesson
Math, addition, decomposing numbers, Critical Area
  55 minutes
number 9
Similar Lessons
Same As Game
Kindergarten Math » Same As
Big Idea: Kindergarteners are very concrete thinkers. Therefore, if 2 + 3 = 5, then nothing else can equal 5, or at least that's what they initially think. " Same As" develops a new understanding that there can be several combinations to make 5.
Phoenix, AZ
Environment: Urban
Dawn Gunn
It Starts With a Seed…
Kindergarten Science » Pumpkins
Big Idea: Selecting their own germination environment allows students a chance to plan and carry out their own investigation.
Lexington Park, MD
Environment: Suburban
Joanne  Clapp
Farmer Fred's Fenceposts-The Plus and Equal Sign
Kindergarten Math » Introduction to Addition and Subtraction
Big Idea: Although understanding the plus and equal sign are not a kindergarten Common Core standard, exposure to the concept provides a foundation for future learning and preparation for standardized testing.
Cold Spring, MN
Environment: Rural
Joyce Baumann
Something went wrong. See details for more info
Nothing to upload