Grade 3/Addition
Addition: Add Whole Hundreds (431)
Add two multiples of 100 together. Practice mental math with hundreds. Example: 400 + 300 = 700
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Quick Tip
When adding hundreds, think about how many hundreds total, then write that many hundreds.
Teacher Resources
Teaching Notes
Help learners connect adding hundreds to basic addition facts (e.g., 4+3=7 implies 400+300=700). Encourage mental math strategies by focusing on the number of hundreds.
Vocabulary
Hundreds: Place value representing 100 units.
Addend: A number added in an addition problem.
Common Mistakes
- Forgetting to include the trailing zeros in the sum.
- Mistaking hundreds for tens or ones in a mixed problem.
- Struggling to relate adding hundreds to basic number facts.
Differentiation
SupportUse base ten blocks or drawings to visualize the hundreds being added.
ChallengeExtend to adding three multiples of 100 or larger numbers.
Discussion Questions
- How is adding 400 + 300 similar to adding 4 + 3?
- What pattern do you notice when adding numbers that are multiples of 100?
- Why are the two zeros important when we write the sum of whole hundreds?
- Can you think of a real-world situation where you might add whole hundreds?
Extension Activities
- Count by hundreds to 1000.
- Use base-ten blocks.
- Add three hundreds.
Parent Tip
Ask your child to count 100 blocks, then another 100, and then combine them.
Learning Path
Skill Cluster
Number Sense and Place Value
Estimated Time
15 minutes
Skills Practiced
add whole hundredsplace value understandingmental math strategies
Prerequisites
- Addition facts to 20
- Place value to hundreds
- Adding multiples of 10
Next Steps
- Adding 3-digit numbers (no regrouping)
- Adding whole thousands
- Addition: Add Whole Tens (2 Addends)
- Subtraction: Subtract Whole Hundreds (2 Numbers)
- Addition: Add 3-Digit Numbers (No Regrouping)