## Reflection: Checks for Understanding Adding 3 Digits to 3 Digits Using Expanded Form - Section 1: Mini-Lesson

Introducing strategies by putting the completed process on the board and asking students to look at it and make meaning is one of my favorite warm up activities.

When I do this, I am asking students to look through the math using their knowledge of numbers to make sense of a series of steps and make their own meaning.  When they can communicate what they already understand, and the steps that don't make sense to them, I am able to quickly focus my lesson on what they need for the day's task.

It is also a wonderful way for the children to make the process or algorithm their own, rather than me just telling them to use a strategy without reason.

As I listen to them discuss the expanded notation strategy, I will listen for accurate use of vocabulary terms and listen to how the children describe their understandings and confusions to each other.

Try it-it is worth the 5 minutes!

Making Sense of a Procedure
Checks for Understanding: Making Sense of a Procedure

# Adding 3 Digits to 3 Digits Using Expanded Form

Unit 9: Place Value
Lesson 4 of 10

## Big Idea: Decomposing a large number into its expanded form is helpful in strengthening one's mental math ability. This lesson is designed to give the students practice in using this important strategy.

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Standards:
Subject(s):
Math, Place Value, Number Sense and Operations, sum, expanded notation, ones, ten, hundreds, addends, addition
50 minutes

### Michelle Marcus

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