## Reflection: Gradual Release Watch my number grow! - Section 2: Plant the Seed!

I noticed some of my students did not understand how to represent three-digit numbers with zeros. For instance, there were quite a few three-digit numbers in the video with zeros in the tens and ones place. When some students used base-tens to represent the number 406, they became a bit puzzled. They wanted to know which type of block would represent zero. Even when some students wrote 406 in expanded form, they put a zero in the tens place. I wanted them to know that this was not necessary. The zero simply means there are no tens.

I write 509 on the board. How many hundreds are there? (5 hundreds) How many tens are there? (There are no tens). How many ones are there? (9 ones) So the expanded form is 500 + 9.

I post a large place value chart. I help students read the chart from the left to right so that students see the digits as I say the value of each digit. I continue to model numbers throughout the lesson or until students are able to do it on their own. (scaffolding)

What I noticed!

# Watch my number grow!

Unit 1: Numbers & Operation in Base Ten Grade 2
Lesson 4 of 10

## Big Idea: In this lesson students use place value and base-ten materials to learn how to write numbers in expanded form.

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36 teachers like this lesson
Standards:
Subject(s):
Math, modeling, Place Value, Number Sense and Operations, reasoning, discussions, expanded form
30 minutes

### Carol Redfield

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