Grade 3/Addition
Missing Digits: Addition Puzzles
Vertical sums with one missing digit inferred by carries.
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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
Prerequisites
- 761
- 762
- Basic addition facts
- Addition with regrouping
- Place value understanding
Next Steps
- Missing digits subtraction puzzles
- Algebraic equations with unknowns
- Missing Digits: Subtraction Puzzles
- Multi-Digit Addition Challenge
- Missing Digits: Addition Puzzles - Set B (Advanced)