2nd Grade Math Lesson

Building Numbers: Hundreds, Tens, and Ones

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2nd GradeThin-Slicing2.NBT.A.1 — Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones50 min

Learning Objective

Students will understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones (2.NBT.A.1), and will compose and decompose three-digit numbers using place value understanding.

Lesson Overview

Students progress from identifying single-digit place value positions to composing and decomposing three-digit numbers using a real-world context of counting items in a school supply store. Tasks are thin-sliced so only one variable changes at a time, building toward flexible representation of three-digit numbers.

Materials

Vertical whiteboards or chart paper
Dry-erase markers (multiple colors)
Base-ten blocks (hundreds flats, tens rods, ones cubes)
Place value mats (hundreds | tens | ones)
Random grouping cards
Mini whiteboards and markers for warm-up
Exit slip papers

Scaffolded Task Progression

1Task 1

The store has some pencils on the shelf. Use the place value mat below.

🟦🟦🟦 (ones cubes)

How many ones are there? Write the number.

[ Interactive graph / diagram — available in the full lesson ]

2Task 2

Now the store has pencil bundles on the shelf.

🟧🟧 (tens rods)

How many tens are there? How many pencils is that in all? Write the number.

[ Interactive graph / diagram — available in the full lesson ]

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