Texas Essential Knowledge and Skills (TEKS):
3.2.A
compose and decompose numbers up to 100,000 as a sum of so many ten thousands, so many thousands, so many hundreds, so many tens, and so many ones using objects, pictorial models, and numbers, including expanded notation as appropriate;
Florida - Benchmarks for Excellent Student Thinking:
MA.3.NSO.1.2
Compose and decompose four-digit numbers in multiple ways using thousands, hundreds, tens and ones. Demonstrate each composition or decomposition using objects, drawings and expressions or equations.
3rd Grade Math - Model Numbers Lesson
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.