## Reflection: Checks for Understanding Where Are Our Understandings - Section 2: Assessment of Prior Learning

I used this lesson to assess current understanding of place value. I wanted to look at student's understanding of place value for ones, tens and hundreds, but beyond that I wanted to assess student understanding of using place value to solve addition and subtraction problems. Common Core Standards for second grade include using place value standards to add and subtract two-digit numbers (2.NBT.B.5).

As I scored student work, I noticed that students fell into 3 levels of understanding. One group understood place value of ones, tens and hundreds and applied that understanding to the solving of 2-digit addition and subtraction problems. These students were accurate in their use of grouping and regrouping of tens and ones to solve the problems. This set of students has met the standards for grade 2 and can now extend that thinking with more complex problems.

A second group, about 66% of the class, understood place value with tens and ones and hundreds but applied that to addition and subtraction of 2-digit numbers less than 50% of the time. There were places where these students applied place value strategies, but especially with subtraction, they applied the understanding incorrectly.

The final group, only about 8% of the class still were not able to identify the value of digits in 3-digit numbers.

The final group will need extra practice with this skill to help them and for this I will turn to some first grade BetterLesson ideas to reinforce their understanding.

For the majority of the class, I will continue to provide experiences with applying place value strategies.

Where Are We ?
Checks for Understanding: Where Are We ?

# Where Are Our Understandings

Unit 12: More Complex Numbers and Operations
Lesson 1 of 10

## Big Idea: Before moving on, sometimes it is important to look back. What do my students know and what misunderstandings do I need to work with?

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Standards:
Subject(s):
Math, Place Value, Number Sense and Operations, addition, subtraction, expanded notation, place value strategies
55 minutes

### Beth McKenna

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