Grade 2/Subtraction
Subtract Whole Tens from 3-Digit Numbers Without Regrouping (264)
Practice subtracting whole tens from 3-digit numbers without regrouping.
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Quick Tip
Subtracting whole tens without regrouping helps build confidence in subtraction.
Teacher Resources
Teaching Notes
Focus on place value to help students easily subtract whole tens from 3-digit numbers without regrouping. Emphasize that only the tens digit changes, while hundreds and ones remain the same.
Vocabulary
Tens place: The position of the tens digit.
Hundreds place: The position of the hundreds digit.
Common Mistakes
- Subtracting from the wrong place value (e.g., ones instead of tens)
- Incorrectly changing the hundreds or ones digit
Differentiation
SupportUse base-10 blocks or a hundreds chart to visualize the subtraction. Provide a place value chart to align numbers.
ChallengeChallenge students with mental math strategies or introduce subtracting multiples of 10 (e.g., 20, 30) from 3-digit numbers without regrouping.
Discussion Questions
- What happens to the ones digit when we subtract a whole ten?
- How does understanding place value help us subtract these numbers quickly?
- Can you give an example of when we might need to use this skill in real life?
Extension Activities
- Subtract tens on a number line.
- Word problems with tens.
Parent Tip
Ask your child to count backward by tens from a 3-digit number.
Learning Path
Skill Cluster
Number Sense & Operations - Place Value
Estimated Time
15 minutes
Skills Practiced
subtracting tens from 3 digitplace value subtraction
Prerequisites
- Place Value (Hundreds, Tens, Ones)
- Subtracting multiples of 10 from 2-digit numbers
Next Steps
- Subtracting any 2-digit number from a 3-digit number (no regrouping)
- Subtracting whole hundreds from 3-digit numbers
- Subtract 2-digit numbers from 3-digit numbers (no regrouping)
- Subtract whole hundreds from 3-digit numbers
- Subtract whole tens from 3-digit numbers (with regrouping)