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Grade 3 · Mathematics · 25 minutes

Round to the nearest ten

Mark 40 and 50 on a number line. Use neighboring tens to estimate a number.

Mr. S Teaches · Starter mini-lesson · elem-3-round-to-the-nearest-ten

Learning objective

Explain and practice round to the nearest ten using the activity and evidence, then show the reasoning behind an answer.

Gather your materials

  • Paper and pencil
  • Counters, blocks or paper pieces
  • A ruler, clock model or grid when named in the steps

Use the items named in the teaching steps; paper models or adult-prepared photographs can replace physical equipment.

Common Core skill focus

3.NBT.A.1

Use place value to round whole numbers to tens or hundreds.

Read the official standard ↗

Code and grade verified 2026-11-03. This mini-lesson addresses a selected skill, not the entire standard.

Teach it step by step

  1. Mark 40 and 50 on a number line.
  2. Place 47 and locate the midpoint 45.
  3. Compare the distances to each ten.
  4. Round to the closer ten; explain the usual halfway rule.

Watch, notice, discuss

Video choices for this lesson

2 choices

Preview a video, then choose what fits your learners. “Show to class” opens a larger view; use the player’s play and full-screen controls when you’re ready.

Teacher preview needed. Check the language, level and length before showing. YouTube may show ads or related videos.

After watching

Place a number between neighboring tens on a number line. Which ten is nearer?

An external player loads only after you choose Preview or Show to class. Playback connects to YouTube. Videos belong to their creators; availability and embedding can change.

Make the thinking visible

Example to work through together

47 is 3 away from 50 and 7 from 40, so it rounds to 50.

Try the starter activity

Place 47 on a number line from 40 to 50.

Student practice

Round 42, 65 and 78 to the nearest ten and justify each choice.

Quick check for understanding

Which ten is closest?

Sample answer and teacher guidance

Sample answer: 50

Listen or look for: 40, 70 and 80. At 65, the standard rounding convention rounds halfway up to 70.

Invite the learner to explain, demonstrate, draw or dictate their reasoning. Revisit a teaching step when the explanation is unclear.

Make it work for your learner

A little more support

Provide a line labeled at every unit.

An additional challenge

Find all whole numbers that round to 50 to the nearest ten.