Grade 1/Addition
Add Whole Tens (754)
Fluency adding whole tens to 2-digit numbers.
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Teacher Resources
Teaching Notes
Emphasize adding tens affects only the tens place.
Common Mistakes
- Adding to the ones digit
- Incorrectly identifying tens place
- Forgetting to update the tens value
Differentiation
SupportUse base-10 blocks or a number line to visualize.
ChallengeAdd whole hundreds; create two-step mental problems.
Discussion Questions
- How does adding 10, 20, or 30 change a number?
- What part of the number stays the same?
- When is it useful to add whole tens mentally?
- Can this strategy be used with other numbers?
Learning Path
Skill Cluster
Number Sense & Mental Math
Estimated Time
8 minutes
Skills Practiced
add whole tens
Prerequisites
- mental_addition_basics
- Counting by 10s
- Place Value (Tens and Ones)
- Adding 10 to a 2-digit number
Next Steps
- Subtract Whole Tens
- Add 2-Digit Numbers (No Regrouping)
- Add Whole Hundreds
- Subtract Whole Tens - Set A
- Add Whole Hundreds - Set A
- Add 2-Digit Numbers No Regrouping - Set A