## Reflection: Problem-based Approaches Life-size Missing Parts of 9 - Section 2: Whole Group Interaction

I hate it that my video could not load completely for you to see they finished the problem with counting up and created the number expression 9-6=3.  It was a great visual representation for them to see how many they had and finding their answer by counting up.  The life-size ten frame would have been sturdier if I had laminated it, but I felt bad to run so much through our school laminator.  Also, I was worried it would somehow go crooked and jam it, but if you can do it, I say go for it! I would suggest folding it in half with the writing on the outside and run it through that way.  Then when you remove it just trim close to the edge and it will open up.  At least the writing side would be laminated.

This would be great to use as a center and they can construct both addition and subtraction problems.  You could make more XL red and yellow counters and definitely laminate them to use for their problems.

Problem-based Approaches: Great visual representation of counting up

# Life-size Missing Parts of 9

Unit 4: Understanding Subtraction
Lesson 3 of 10

## Big Idea: I want them to develop fluency in subtraction and get them ready for future standards like 1.NBT.C.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

Print Lesson
Standards:
Subject(s):
Math, Number Sense and Operations, problem solving, subtraction, Kinesthetic, First Grade, take away, Dominoes
45 minutes

### Jennifer Moon

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