Borrow Over Two Zeros (470)

Teaching Notes

Teach the 'borrowing across zeros' strategy by demonstrating how to regroup from the first non-zero digit. Reinforce place value understanding as the foundation for this complex regrouping.

Vocabulary

Borrowing: Taking value from a higher place.

Zeros: Placeholders needing regrouping.

Common Mistakes

• Forgetting to regroup or regrouping incorrectly when multiple zeros are present.
• Borrowing from the wrong place value or skipping a zero.
• Not adjusting all place values (tens, hundreds) after borrowing from the hundreds.

Differentiation

Discussion Questions

• Why is it especially tricky to subtract when there are zeros in the middle of a number?
• What does it mean to 'regroup' or 'borrow' in the context of subtraction?
• How does understanding place value help us when subtracting across zeros?
• Can you think of a real-life situation where you might need to subtract across zeros?

Extension Activities

• Subtract numbers ending in zeros.
• Practice regrouping to 100.
• Create subtraction stories.

Parent Tip

Use a place value chart to show how to borrow over zeros.

Skill Cluster

Number Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Subtraction with one regrouping
• Place value to thousands

Next Steps

• Multi-digit subtraction with larger numbers
• Multi-step subtraction problems
• Multi-Digit Subtraction
• Subtracting with One Regrouping
• Subtraction Word Problems