Weighing Two Explanations
A 40-minute Grade 2 lesson on judging which of two explanations the town's evidence supports better.
Weighing Two Explanations is a free 40-minute Kindergarten to Grade 2 social studies lesson plan for Common Core standard D2.His.16.K-2 — say which of several reasons is the more likely explanation. 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:
- Kindergarten to Grade 2
- Length:
- 40 minutes
- Standard:
- D2.His.16.K-2
Kindergarten to Grade 2 · History
D2.His.16.K-2
Select which reasons might be more likely than others to explain a historical event or development.
Objective
Students will be able to choose between two explanations and cite the evidence that decides it.
Students are successful when they can
- Chooses one explanation.
- Cites evidence from a source.
- Says what would change their mind.
What you need
- All eight sources
- A likelihood line
- The printable practice sheet linked at the end of this plan
The lesson
Warm-up — place two
5 min- Read two explanations for a town fact.
- Place both on the line.
Teach — cite the evidence that moved it
13 min- Take two explanations for many mill workers living on one street.
- Cite the evidence: the census shows three at one address, all mill workers.
- Move one explanation along the line and say what moved it.
- Say the Grade 2 addition: name what would move it back.
- Leave one pair undecided honestly.
“The census moved it. Now tell me what would move it back the other way.”
Guided practice — choose and cite
12 min- Pairs place four explanation pairs.
- For each they cite evidence from a source.
- For two they say what would change their mind.
Independent practice
8 min- Students complete the weighing page.
- Read each pair aloud.
Close
2 min- Take one choice and what would reverse it.
What goes wrong, and why
Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.
Chooses without citing.
Why: The choice feels obvious.
Fix: Point at the source. A choice with no citation is a hunch.
Cannot say what would change their mind.
Why: The chosen answer feels settled.
Fix: Name the evidence that would reverse it. That is what makes it a judgement.
Calls the rejected explanation impossible.
Why: Choosing feels like eliminating.
Fix: The line, not two boxes.
If they are not there yet
- Two pairs rather than four.
- Give the evidence and choose.
If they finish early
- Place three explanations on one line.
- Argue for the less likely one.
- Say what source would settle a pair the class cannot separate.
Exit ticket
Why did mill workers live on Mill Row? Choose an explanation and cite your evidence.
What to look for: A choice with a source cited. An uncited choice means the point-at-it rule needs restating.
Printable practice for D2.His.16.K-2
Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.
- Weighing Two ExplanationsCircle the more likely reason.
Questions about Weighing Two Explanations
How long does the Weighing Two Explanations lesson take?
40 minutes, split across 5 timed sections: warm-up 5 min, teach 13 min, guided practice 12 min, independent practice 8 min, close 2 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 Weighing Two Explanations teach?
D2.His.16.K-2 — D2.His.16.K-2, History for Kindergarten to Grade 2: “Select which reasons might be more likely than others to explain a historical event or development.” In plain terms, say which of several reasons is the more likely explanation.
What do I need to teach this lesson?
All eight sources, a likelihood line 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: chooses without citing; cannot say what would change their mind and calls the rejected explanation impossible. 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: “Why did mill workers live on Mill Row? Choose an explanation and cite your evidence.” A choice with a source cited. An uncited choice means the point-at-it rule needs restating. 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 Weighing Two Explanations?
Yes — 1 printable D2.His.16.K-2 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 Weighing Two Explanations 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 7 September 2026. Please do not resell it or republish it as your own.
Last reviewed 2026-09-07. Aligned to D2.His.16.K-2 of the C3 Framework for Social Studies State Standards.