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Better Together

A 55-minute Grade 3 lesson on constructing an argument that some animals form groups that help members survive.

Better Together is a free 55-minute Grade 3 science lesson plan for Common Core standard 3-LS2-1 — argue that some animals form groups because it helps them survive. It is timed across 5 sections, gives the exact wording to use where the wording carries the mathematics, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.

Grade:
Grade 3
Length:
55 minutes
Standard:
3-LS2-1

Grade 3 · Life Science

3-LS2-1

Construct an argument that some animals form groups that help members survive.

Objective

Students will be able to argue from evidence that a group helps the animals in it survive.

Students are successful when they can

  • States a claim about the group.
  • Gives evidence from an observation.
  • Names one cost of living in a group.

What you need

  • The ant trail observation, a nature clip of meerkats or starlings
  • A claim-and-evidence frame
  • The printable practice sheet linked at the end of this plan

The lesson

Warm-up

5 min
  1. Read the ant record: one ant moved a crumb 2 cm, six moved it 18 cm.
  2. Ask what the six did that one could not.

Teach — claim, evidence, cost

14 min
  1. Write the claim: forming a group helps these ants survive.
  2. Give the evidence: 2 cm alone against 18 cm together, same crumb.
  3. Ask what made that a fair comparison. The same crumb.
  4. Do meerkats: one on lookout lets the others feed.
  5. Now the honest half: name a cost. Food has to be shared.
  6. Say what a good argument here has: a claim, evidence, and the cost admitted.
“What is your evidence, and what does the group cost them?”

Investigate — watch and count

19 min
  1. Groups watch an ant trail or a clip and count what individuals and groups achieve.
  2. They record a comparison of one against several.
  3. They write a claim with the evidence under it.
  4. They add one cost of group living.

Independent practice

14 min
  1. Students complete the 'Better Together' page.
  2. Check answers use evidence rather than assertion.

Close

3 min
  1. Ask whether a group is always better, and take the honest answer.

What goes wrong, and why

Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.

Says groups are always better.

Why: Every example showed a benefit.

Fix: Ask about sharing food and spreading disease. Groups cost something.

Gives a claim with no evidence.

Why: It seems obvious.

Fix: Point at the frame. 2 cm against 18 cm is what makes it an argument.

Compares a group to nothing.

Why: The group achieved a lot.

Fix: Compared with what? You need the single animal too.

If they are not there yet

  • The comparison supplied, with the claim to write.
  • Two animals rather than four.

If they finish early

  • Find an animal that lives alone and say why that suits it.
  • Say what would settle whether wolves hunt better in packs.
  • Explain why starling flocks confuse a hawk.

Exit ticket

One ant moved a crumb 2 cm and six moved it 18 cm. Write a claim with that evidence, and name one cost of group living.

What to look for: A claim that grouping helps them survive, backed by the two figures, plus a cost such as sharing food. No cost means the honest half is missing.

Printable practice for 3-LS2-1

Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.

Questions about Better Together

How long does the Better Together lesson take?

55 minutes, split across 5 timed sections: warm-up 5 min, teach 14 min, investigate 19 min, independent practice 14 min, close 3 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.

Which standard does Better Together teach?

3-LS2-1 — 3-LS2-1, Life Science for Grade 3: “Construct an argument that some animals form groups that help members survive.” In plain terms, argue that some animals form groups because it helps them survive.

What do I need to teach this lesson?

The ant trail observation, a nature clip of meerkats or starlings, a claim-and-evidence frame and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.

What mistakes should I expect in this lesson?

Three, each a reasoning error rather than carelessness: says groups are always better; gives a claim with no evidence and compares a group to nothing. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.

How do I know whether the lesson worked?

The exit ticket asks: “One ant moved a crumb 2 cm and six moved it 18 cm. Write a claim with that evidence, and name one cost of group living.” A claim that grouping helps them survive, backed by the two figures, plus a cost such as sharing food. No cost means the honest half is missing. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.

Is there a worksheet to go with Better Together?

Yes — 1 printable 3-LS2-1 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.

Is Better Together free to use?

Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on 8 September 2026. Please do not resell it or republish it as your own.

Last reviewed 2026-09-08. Aligned to 3-LS2-1 of the Next Generation Science Standards.