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Lesson Plan Template

  • Grade

  • Subject

  • Section

Third

Math

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  • Competency

Rounding

  • Aligned Standards

Number and Operations in Base Ten

  • Strand

3.NBT.A.1

  • Vocabulary

Rounding: Adjusting a number to a nearby and simpler number.

Nearest Hundred: The closest hundred to a given number (e.g., 300, 400).

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Round to Nearest Ten or Hundred On a Number Line

Prerequisite Skill

Round to the Nearest Ten

Materials and Preparation

  • Whiteboard and markers
  • Number line diagrams
  • Worksheets for guided practice, independent practice, and assessment
  • Exit tickets
  • Homework assignment sheets

Learning Objectives

  • Students will understand how to round whole numbers to the nearest hundred.
  • Students will use number lines to visualize and understand rounding.

Introduction

Begin the lesson by explaining the concept of rounding. Use an example, such as rounding the number 309 to the nearest hundred. Show a number line with the numbers 300, 309, and 400 marked. Explain that 309 is between 300 and 400, and since it is closer to 300, it rounds down to 300.

Explicit Instruction/Teacher modeling

  • Explain the rule for rounding to the nearest hundred: If the tens digit is 5 or greater, round up. If it is less than 5, round down.
  • Use several examples to illustrate this rule, such as 250, 267, and 349. Show these on a number line to visualize the rounding process.
  • Demonstrate rounding step-by-step, asking students to help identify which hundred the number is closest to.

Guided Practice

  • Distribute number line diagrams to students.
  • Work through several examples as a class, such as 274, 904, and 956.
  • Have students come up to the board to draw the position of the numbers on the number line and determine which hundred they are closest to.

Independent Practice

  • Provide a worksheet with a variety of numbers for students to round to the nearest hundred.
  • Include a number line for each problem so students can visually verify their rounding.

Differentiation

Support

  • Provide additional number line diagrams for students who need extra practice.
  • Pair students who are struggling with those who understand the concept well for peer support.

Extension

  • Explore rounding to the nearest ten and nearest thousand.
  • Use real-life examples, such as rounding prices or distances, to practice rounding skills.

Assessment

Use an assessment worksheet that includes problems requiring students to round numbers to the nearest hundred and to explain their reasoning. Review the assessment to ensure understanding and identify any areas needing further clarification.

Review and closing

Recap the lesson by reviewing the rule for rounding to the nearest hundred and the use of number lines. Address common misconceptions, such as confusing rounding up with rounding down. Allow students to ask any final questions, share their observations, or express any curiosities they have.

Misconceptions

  • Thinking that all numbers round up regardless of the tens digit.
  • Confusing rounding rules for different place values.
  • Not understanding the importance of the number line in visualizing rounding.
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