Subtracting 2-Digit Numbers from Whole Hundreds (462)

Lesson Plan

Subtracting with Hundreds

Standards

Printable Aids

Teaching Notes

Emphasize understanding place value and regrouping from the hundreds place across the tens to the ones. Use manipulatives (e.g., base ten blocks) to model the decomposition of 100 into 9 tens and 10 ones.

Vocabulary

Regroup: Borrowing from a place value.

Borrow: Taking from a higher place value.

Common Mistakes

• Not regrouping across the zero in the tens place correctly.
• Subtracting the top digit from the bottom digit if the top digit is smaller, instead of regrouping.

Differentiation

Discussion Questions

• How is subtracting from 100 similar to and different from subtracting from a 2-digit number?
• What happens when you need to subtract from a zero, and how do you solve it?

Extension Activities

• Subtract from larger hundreds.
• Create word problems.

Parent Tip

Use play money to practice subtracting 2-digit amounts from $100.

Skill Cluster

Subtraction with Regrouping

Grade Level

2-3

Skills Practiced

Prerequisites

• Place Value to 1000
• Basic Subtraction
• Place Value (Hundreds, Tens, Ones)
• Subtracting 2-Digit Numbers without Regrouping
• Understanding Regrouping/Borrowing Concept

Next Steps

• 3-Digit Subtraction
• Mental Math Strategies
• Subtracting 3-Digit Numbers with Regrouping
• Subtracting Across Zeros
• Subtracting 2-Digit Numbers from 3-Digit Numbers
• Subtraction with Regrouping (up to 1000)