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Grade 2/Addition

Missing Addend: Whole Hundreds Addition

Solve for the missing whole hundred using subtraction or counting on.
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#WorksheetQuestionsActions
Easy(Hundreds to 500, find missing)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Medium(Hundreds to 900, find missing)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Hard(Hundreds 400–900, find missing)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Prerequisites
Addition: Add Whole Hundreds6 WS
400 + 300 = ______
What to Do Next
Addition: Missing Number - Multiples of 1006 WS
______ + 200 = 500

Practice Questions

  1. 400 + ? = 700
    Show answer

    300

  2. 200 + ? = 800
    Show answer

    600

  3. 500 + ? = 900
    Show answer

    400

  4. 300 + ? = 600
    Show answer

    300

  5. 700 + ? = 1000
    Show answer

    300

Quick Tip
Subtract the known part from the total or count up by hundreds.
Teacher Resources
Teaching Notes

Applies subtraction thinking to find missing addends. Two strategies: 1) Count up by hundreds (300, 400, 500... to 800), or 2) Subtract (800 - 300 = 500). Both develop number sense and inverse operation understanding.

Vocabulary
Addend: A number added to another number.
Sum: The result of adding numbers.
Common Mistakes
  • Subtracting in wrong direction
  • Counting from zero instead of from first number
  • Wrong number of zeros in answer
  • Not checking answer by adding back
  • Forgetting place value (e.g., 200 + __ = 500, answer is 3, not 300).
  • Confusing operations (adding instead of subtracting, or vice versa).
  • Errors in mental arithmetic when counting on or back by hundreds.
Differentiation
SupportProvide base-ten blocks or hundreds flats drawings. Start with smaller missing addends (e.g., 100 + __ = 300). Use a number line for visual counting.
ChallengeIntroduce problems with missing addends involving tens and ones (e.g., 230 + __ = 500). Challenge with multi-step missing addend problems.
Discussion Questions
  • How can we use subtraction to find a missing number in an addition problem?
  • What strategies can you use to quickly add or subtract hundreds mentally?
  • How is adding whole hundreds similar to adding single-digit numbers?
Extension Activities
  • Count by hundreds forward.
  • Count by hundreds backward.
  • Find missing hundreds.
Parent Tip

Ask your child to count by hundreds from a starting number to a target number.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
Missing addend hundredsCounting by hundreds