## Reflection: Checks for Understanding What's in Your Zoo? - Section 1: Build on What You Know

During the beginning of the lesson I noticed some students struggled with place value concepts. I paused the lesson for about 10 minutes to review what students needed to know in order to be successful in this lesson.  Students needed to build on their various strategies for adding to fluently add and subtract within 1000.

I gave students about ten minutes or so to work with numbers. Click for Extension Ideas.

As students worked with numbers they began to understand how important place value and number sense is when adding and subtracting numbers. One student point out she was grouping her number wrong.) I noticed students were able to correct themselves after working with the concept for a while.

Checks for Understanding: Prerequisite

Unit 1: Numbers & Operation in Base Ten Grade 2
Lesson 8 of 10

## Big Idea: In this lesson, students will create pictures using base ten blocks as models for numbers between 200 and 1000.

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Standards:
Subject(s):
Math, Number Sense and Operations, problem solving, reasoning, adding, explain, illustration
50 minutes

### Carol Redfield

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