Grade 1/Addition
Missing Addend (Whole Tens)
Missing addend when the step is a whole ten.
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Teacher Resources
Teaching Notes
Connect to subtraction as a check.
Common Mistakes
- Forgetting place value
- Incorrect subtraction
- Confusing tens and ones
- Miscounting tens
Differentiation
SupportUse physical manipulatives or number lines. Practice skip counting by tens.
ChallengeSolve multi-step problems with tens. Challenge with hundreds or thousands.
Discussion Questions
- How is adding tens like adding ones?
- What strategy did you use?
- Explain your reasoning with tens.
- Model with tens blocks or number line.
Learning Path
Skill Cluster
Number Sense and Operations
Estimated Time
8 minutes
Skills Practiced
missing addend tens
Prerequisites
- add_whole_tens
- Addition and Subtraction to 20
- Skip Counting by 10s
Next Steps
- Missing Addend (Whole Hundreds)
- Adding/Subtracting Two-Digit Numbers
- Adding Whole Tens
- Subtracting Whole Tens