2.2.A 2.2.B

Place Value 2nd Grade

Texas Essential Knowledge and Skills (TEKS): 2.2.A
use concrete and pictorial models to compose and decompose numbers up to 1,200 in more than one way as a sum of so many thousands, hundreds, tens, and ones;
Texas Essential Knowledge and Skills (TEKS): 2.2.B
use standard, word, and expanded forms to represent numbers up to 1,200;

A four-digit number is made up of thousands, hundreds, tens, and ones.

The digits in the number show how many
thousands, hundreds, tens, and ones.

Example:

The number has a 5 in the hundreds place, an 8 in the tens place, and a 2 in the ones place.

So, 582 equals 5 hundreds, 8 tens, and 2 ones.

Example:

The number equals 0 tens, 7 hundreds, and 2 ones.

This means it has a 7 in the hundreds place, a 0 in the tens place, and a 2 in the ones place.

So, 0 tens, 7 hundreds, and 2 ones equals 702.

A three-digit number is made up of hundreds, tens, and ones.
The digits in the number show how many hundreds, tens, and ones.

The number of hundreds, tens, and ones in a number can be shown using a model.
One way to model a number is to use base 10 blocks.
A flat represents 1 hundred, a rod represents 1 ten, and a unit represents 1 one.

Flat

Rod

Unit

Another way to model a number is to use a tally chart.
The tally marks show the number of hundreds, tens, and ones in the number.

Expanded notation is a way to write a number as the
sum of the value of each digit based on its place value.

Example:

First, use place value to find the value of each digit in the number.

The 8 in the hundreds place represents 8 hundreds.
So, the value of the 8 in the hundreds place is 800.

The 7 in the tens place represents 7 tens.
So, the value of the 7 in the tens place is 70.

The 4 in the ones place represents 4 ones.
So, the value of the 4 in the ones place is 4.

Then, write the values as a sum to write the number in expanded form.

800 + 70 + 4

Example:

In expanded form, the number is separated into a sum of the values of each digit.

The 900 means the number has a 9 in the hundreds place.
The 70 means the number has a 7 in the tens place.
The 2 means the number has a 2 in the ones place.

So, 900 + 70 + 2 written as a number is 972.

Place Value

Texas Essential Knowledge and Skills (TEKS): 2.2.A

use concrete and pictorial models to compose and decompose numbers up to 1,200 in more than one way as a sum of so many thousands, hundreds, tens, and ones;

Texas Essential Knowledge and Skills (TEKS): 2.2.B

use standard, word, and expanded forms to represent numbers up to 1,200;

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