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Grade 2/Addition

Adding whole hundreds (2 addends)

Add two multiples of 100 (whole hundreds) to build quick place value fluency.
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⭐ Easy4
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📊 Medium4
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🔥 Hard4
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Quick Tip
Think in hundreds: add the hundreds digits, then tag on two zeros.
Teacher Resources
Teaching Notes

Extension of adding tens to hundreds. Emphasize place value: we are adding hundreds, not ones. Connect to money (3 hundred-dollar bills + 5 hundred-dollar bills). Show pattern: adding hundreds is just like adding ones, but with two zeros.

Vocabulary
Whole hundreds: Numbers like 100, 200, 300, ending in two zeros.
Place value: The value of a digit based on its position.
Common Mistakes
  • Writing wrong number of zeros (80 instead of 800)
  • Adding like ones (3+5=8 and forgetting hundreds)
  • Confusing hundreds with thousands
  • Not understanding place value
  • Forgetting to include the two zeros in the answer (e.g., 300 + 200 = 5 instead of 500)
  • Misunderstanding the value of digits in the hundreds place
Differentiation
SupportUse concrete manipulatives like base ten blocks or a number line to skip count by 100s. Relate to counting money (e.g., $300 + $200).
ChallengeIntroduce adding three whole hundreds or adding a whole hundred to a number with tens and ones (e.g., 300 + 150). Challenge with missing addend problems (e.g., 400 + ___ = 700).
Discussion Questions
  • How is adding 300 + 200 similar to adding 3 + 2?
  • What patterns do you notice when adding whole hundreds?
  • Can you think of a real-life situation where you would add whole hundreds?
Extension Activities
  • Add 3 whole hundreds.
  • Add whole thousands.
  • Use base-ten blocks.
Parent Tip

Ask your child to count by hundreds up to 1000.

Learning Path
Skill Cluster

Number Sense & Place Value

Estimated Time

15 minutes

Skills Practiced
adding whole hundredsplace value understandingaddition properties
Prerequisites
  • Skip counting by 100s to 1000
  • Basic addition facts within 20
  • Understanding place value (hundreds, tens, ones)
Next Steps
  • Adding multiples of 10 (2 addends)
  • Adding whole hundreds to other 3-digit numbers (e.g., 300 + 125)
  • Adding 3-digit numbers without regrouping