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15-Minute Lesson Plan: Rounding Numbers

Grade Level: 3–5
Time: 15 minutes
Topic: Rounding Numbers
Materials:

Learning Objective

Students will round numbers to a specified place value by identifying the digit to look at and using the 5 or more, raise the score; 4 or less, let it rest rule.

1. Warm-Up — 3 Minutes

Write on the board:

47 → nearest ten

Ask:

“Which two tens is 47 between?”

Students identify 40 and 50.

Ask:

“Is 47 closer to 40 or 50?”

Students answer 50.

Repeat quickly:

32 → nearest ten

Expected answer: 30

Then introduce the key rule:

0–4 → stay
5–9 → increase

2. Teacher Modeling — 4 Minutes

Write:

268 → nearest hundred

Walk students through the process:

  1. Find the hundreds place: 2.

  2. Look at the digit immediately to its right: 6.

  3. Because 6 is 5 or more, increase the hundreds digit.

  4. Change the digits to the right to zeros.

268 → 300

Model one more:

243 → nearest hundred

The tens digit is 4, so the hundreds digit stays the same.

243 → 200

Ask students:

“Why did 268 round up but 243 round down?”

Emphasize that students must look one place to the right of the place they are rounding.

3. Guided Worksheet Practice — 5 Minutes

Give students the Math-Aids rounding worksheet.

Have students complete the first few problems independently while you circulate.

Use these prompts:

  • “What place are you rounding to?”

  • “Which digit tells you whether to round up or down?”

  • “Is that digit 5 or greater?”

  • “What happens to the digits after the rounding place?”

Have students explain one answer to a partner before continuing.

If using the Math-Aids decimal version, apply the same strategy: students round to the specified tenths, hundredths, or thousandths place and look one digit to the right. (Math-Aids)

4. Quick Check — 3 Minutes

Write:

3,749 → nearest hundred

Ask students to solve independently.

Expected answer:

3,700

Then ask:

“What digit did you use to make your decision?”

Expected response:

The tens digit, 4.

Exit Question

6,582 → nearest thousand

Expected answer:

7,000

Ask students to briefly explain why.

Differentiation

Students needing support:
Use a place-value chart and highlight the digit students must examine. Begin with rounding to the nearest ten.

Students working at grade level:
Use the worksheet's mixed rounding problems and require students to identify the rounding place before solving.

Students needing a challenge:
Have students create a number that rounds to 5,000 when rounded to the nearest thousand. Ask them to create both a number that rounds up and one that rounds down.

Assessment

During the worksheet practice, check whether students can:

  • Identify the requested place value.

  • Look at the digit immediately to the right.

  • Decide whether to round up or down.

  • Change the remaining digits appropriately.

  • Explain their reasoning.

Success Criteria:
“I can identify the place I am rounding to, look at the next digit, and round correctly.”

Teacher Tip: Math-Aids worksheets are dynamically generated, so you can create additional versions for reteaching, homework, or independent practice. (Math-Aids)

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Posted: 8/17/26