Subtracting Three-Digit Numbers Printable Lesson Plan

Lesson Title:”Subtracting Three-Digit Numbers”

Lesson Objective: Students will be able to subtract three-digit numbers with regrouping (borrowing) and without regrouping.

Materials:

Whiteboard and markers

Student worksheets with subtraction problems involving three-digit numbers

Base-10 blocks or manipulatives (such as base-10 blocks or place value charts)

Introduction (10 minutes):

Begin the lesson by reviewing the concepts of place value and regrouping. Use base-10 blocks or manipulatives to demonstrate how regrouping works when subtracting two-digit numbers.

Write an example on the board, such as “25 – 17 = ?” and show how to regroup the ones place to make the problem “25 – 7 = 18”

Ask students if they have any questions about regrouping, and address any misconceptions.

Direct Instruction (20 minutes):

Introduce the concept of subtracting three-digit numbers. Explain that when subtracting three-digit numbers, we will sometimes need to regroup in both the ones place and the tens place.

Write an example on the board, such as “456 – 123 = ?” and show how to regroup the ones place to make the problem “456 – 100 – 23 = 333”

Point out that when regrouping in the tens place, we need to be careful to borrow the correct number of tens.

Show another example “735 – 312 = ?” and demonstrate how to regroup the ones and tens place to solve the problem “735 – 300 – 12 = 423”

Allow students to work through a few subtraction problems on their own, with guidance and support as needed.

Guided Practice (20 minutes):

Provide students with a worksheet that includes a variety of subtraction problems involving three-digit numbers, both with and without regrouping.

Have students work in pairs or small groups to complete the worksheet.

Walk around the room and assist students as needed, providing guidance and feedback on their work.

Independent Practice (15 minutes):

Provide students with a set of individual problems that they can work on independently.

Allow students to check their work against the answer key and provide feedback on their understanding of the material.

Closure (5 minutes):

Review the key concepts of the lesson, such as place value, regrouping and borrowing with the class.

Address any remaining questions or misconceptions.

Assign homework if applicable.

Assessment:

Observe student work during independent practice

Collect and review student worksheets

Administer a quiz or assessment at a later date to check for understanding and retention of the material.

Note: The above timings is just a suggestion. Depending on the class size, students’ prior knowledge and pacing, the timings may vary. Also, the above plan is just a starting point, you can customize it as per your class needs.