Subtract Whole Tens from 3-Digit Numbers (459)

Teaching Notes

Focus on place value understanding, especially when regrouping from the hundreds. Emphasize that subtracting tens affects the tens place, potentially requiring a trade from the hundreds.

Vocabulary

Regroup: Borrowing from a higher place value.

Hundreds place: The digit representing multiples of one hundred.

Common Mistakes

• Forgetting to regroup when the minuend's tens digit is smaller.
• Incorrectly subtracting from the hundreds place when not needed.
• Misaligning digits if not using vertical subtraction.

Differentiation

Discussion Questions

• How does place value help you subtract tens from a 3-digit number?
• When do you need to regroup across place values?
• What strategies can you use to check your answer?
• How is subtracting tens similar to subtracting ones?

Extension Activities

• Subtracting tens with base-ten blocks.
• Create word problems.
• Number line jumps by tens.

Parent Tip

Practice subtracting groups of ten from numbers using objects.

Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Understanding Place Value (Hundreds, Tens, Ones)
• Subtracting Multiples of Ten (within 100)
• Subtracting 2-Digit Numbers with Regrouping

Next Steps

• Subtracting 3-Digit Numbers with Regrouping
• Subtracting Multiples of Hundred from 3-Digit Numbers
• Adding and Subtracting within 1000
• Subtract Multiples of 100 from 3-Digit Numbers
• Subtract Two-Digit Numbers from Three-Digit Numbers (No Regrouping)
• Subtract Two-Digit Numbers from Three-Digit Numbers (With Regrouping)