Grade 3/Subtraction
Find the Missing Addend (via Subtraction) (800)
Use subtraction to find the unknown addend in an addition equation.
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Teacher Resources
Teaching Notes
Emphasize inverse relationship.
Vocabulary
Addend: A number added in an addition problem.
Missing Addend: An unknown number in an addition problem.
Common Mistakes
- subtract smaller from larger incorrectly
- Adds instead of subtracts
- Subtracts wrong numbers
- Does not check work
- Confuses addends/sum
Differentiation
SupportUse manipulatives or a number line for support.
ChallengeSolve word problems with missing addends.
Discussion Questions
- How are addition and subtraction related?
- Why do we subtract to find a missing addend?
- How does checking your work help?
- When might you use this skill in daily life?
Extension Activities
- Use fact families to solve.
- Draw a bar model.
- Guess and check.
Parent Tip
Ask: 'I have 5 cookies, and 8 total. How many more do I need?'
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
12 minutes
Skills Practiced
inverse add subtract
Prerequisites
- Basic Addition Facts
- Basic Subtraction Facts
Next Steps
- Missing Numbers in Subtraction Equations
- Solving Equations with Variables
- Multi-digit Missing Addends
- Fact Families: Addition & Subtraction
- Solving for Unknowns: Subtraction Equations
- Introduction to Algebraic Equations