Printable Lesson Plan on Adding Three-Digit Numbers

Lesson Title:”Adding Three-Digit Numbers”

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

Materials:

  • Whiteboard and markers
  • Student worksheets with addition 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 adding 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 + 10 + 7 = ?”
  • Ask students if they have any questions about regrouping, and address any misconceptions.

    • Direct Instruction (20 minutes):

  • Introduce the concept of adding three-digit numbers. Explain that when adding 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 “123 + 45 = ?” and show how to regroup the ones place to make the problem “123 + 40 + 5 = ?”
  • Point out that when regrouping in the tens place, we need to be careful to carry over the correct number of tens.
  • Show another example “235 + 112 = ?” and demonstrate how to regroup the ones and tens place to solve the problem “235 + 100 + 12 = ?”
  • Allow students to work through a few addition problems on their own, with guidance and support as needed.

    • Guided Practice (20 minutes):

  • Provide students with a worksheet that includes a variety of addition 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 and regrouping, 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.