Grade 2/Place Value & Rounding
Place Value: Compose 3-Digit Numbers (404)
Compose and decompose 3-digit numbers using hundreds, tens, and ones; convert between expanded and standard form.
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Teaching Notes
Reinforce the value of each digit's position. Emphasize that numbers are built from hundreds, tens, and ones.
Vocabulary
Compose: To put together or build.
Expanded Form: Showing a number as a sum of place values.
Common Mistakes
- Misplacing digits when a place value is zero.
- Confusing hundreds, tens, and ones positions.
- Incorrectly combining parts, especially with missing tens or ones.
Differentiation
SupportUse base-ten blocks or place value charts for visual support.
ChallengeChallenge with larger numbers or numbers with missing place values.
Discussion Questions
- How does expanded form help us understand the value of each digit?
- What does it mean if a number has a zero in the tens place?
- How is 235 different from 532, even though they use the same digits?
- Can you compose a number if you know the hundreds, tens, and ones?
Extension Activities
- Write numbers in expanded form.
- Practice composing 4-digit numbers.
- Use base-ten blocks.
Parent Tip
Use blocks or objects to represent hundreds, tens, and ones.
Learning Path
Skill Cluster
Number Sense: Place Value
Estimated Time
15 minutes
Skills Practiced
composing 3 digit numbersexpanded form to standardplace value 3 digit
Prerequisites
- Understanding 2-Digit Place Value
- Addition within 100
Next Steps
- Decomposing 3-Digit Numbers
- Comparing 3-Digit Numbers
- Place Value: Decompose 3-Digit Numbers
- Place Value: Build 4-Digit Numbers