Which Reason Is More Likely?
A 40-minute Kindergarten lesson on choosing between two possible reasons and saying why one is likelier.
Which Reason Is More Likely? 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 the likelier of two reasons and give evidence.
Students are successful when they can
- Chooses one reason.
- Says what makes it likelier.
- Does not say the other is impossible.
What you need
- Pairs of reason cards
- A likelihood line on the floor
- The printable practice sheet linked at the end of this plan
The lesson
Warm-up — stand on the line
5 min- Read a reason. Children stand along a line from 'very likely' to 'not likely'.
- Ask two of them why they stood there.
Teach — likelier, not certain
13 min- Give two reasons for one past fact.
- Place both on the line and say why one is further along.
- Point at the evidence that moved it.
- Say the careful bit: the other one is not impossible, just less likely.
- Do a second pair where the class disagrees, and leave it disagreed.
“This one is further along the line. Not because the other is silly.”
Guided practice — place four pairs
12 min- Pairs place four reason pairs on a paper line.
- For each they say what moved their choice.
- They find one pair they cannot separate.
Independent practice
8 min- Students complete the which-reason page.
- Read each pair aloud.
Close
2 min- Give a pair. Take the likelier and the reason.
What goes wrong, and why
Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.
Says the less likely reason is impossible.
Why: Choosing one feels like eliminating the other.
Fix: The line, not two boxes. A line has room for 'possible but less likely'.
Chooses the more exciting reason.
Why: Interest stands in for evidence.
Fix: Ask what evidence supports it. Exciting is not likelier.
Refuses to choose at all.
Why: Both are possible, so choosing feels unfair.
Fix: Ask which they would bet on. Judgement under uncertainty is the skill.
If they are not there yet
- Two pairs rather than four.
- Give the evidence and choose.
If they finish early
- Place three reasons on one line.
- Say what would move a reason along the line.
- Argue for the less likely one.
Exit ticket
The old photograph is grey. Which is likelier: the world was grey, or cameras could not do colour?
What to look for: The camera, with a reason. Calling the other impossible means the line, not boxes, 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.
- Which Reason Is More Likely?Circle the more likely reason.
Questions about Which Reason Is More Likely?
How long does the Which Reason Is More Likely? 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 Which Reason Is More Likely? 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?
Pairs of reason cards, a likelihood line on the floor 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 the less likely reason is impossible; chooses the more exciting reason and refuses to choose at all. 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: “The old photograph is grey. Which is likelier: the world was grey, or cameras could not do colour?.” The camera, with a reason. Calling the other impossible means the line, not boxes, 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 Which Reason Is More Likely??
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 Which Reason Is More Likely? 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.