Shark Learning
Grade 4/Addition

Missing Digits: Addition Puzzles

Vertical sums with one missing digit inferred by carries.
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Study Guide

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Easy
1
12 questions
2
12 questions
Medium
1
12 questions
2
12 questions
Hard
1
12 questions
2
12 questions

Practice Questions

  1. NaN + 275 = ?
    Show answer

    723

  2. NaN + 389 = ?
    Show answer

    615

  3. NaN + 258 = ?
    Show answer

    725

  4. NaN + 478 = ?
    Show answer

    787

  5. NaN + 376 = ?
    Show answer

    901

Teacher Resources
Teaching Notes

Treat each column as equation with incoming carry.

Common Mistakes
  • Ignore carry
  • Ignoring carries correctly.
  • Incorrect column alignment.
  • Misunderstanding regrouping.
  • Subtraction errors for unknowns.
Differentiation
SupportUse base ten blocks. Start with 2-digit problems.
ChallengeInclude multiple missing digits. Use larger numbers.
Discussion Questions
  • How does carrying affect each column?
  • Why is place value important here?
  • Can there be more than one answer?
  • How is this like solving a puzzle?
Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

14 minutes

Skills Practiced
Infer missing addend digitCarry reasoning