Foundation Mathematics · AC9MFN02

Subitising to 5

See a small group, know how many, and explain what your eyes noticed

Ready to project and teach

Learning goalStart here
Learning intention

I can look at a small group and know how many without counting each object.

LookSee partsSay totalExplain
Success looks like
  • Recognise 1–5 in more than one arrangement.
  • Say the total after a brief look instead of pointing to every object.
  • Explain helpful parts such as “3 and 2 make 5”.
  • Know that rearranging the same objects does not change the quantity.
I doModel the skill
3 — see the whole
4 — see 2 and 2
5 — see 4 and 1

Teacher talk: “I used a quick look. I did not point to every dot. For 5, I saw four around the outside and one in the middle.”

  • Ask: “How many did you see?”
  • Ask: “What pattern or smaller parts helped you know?”
  • Do not turn subitising into a speed contest.
We doWork it out together

Same amount, different arrangement

Four in a row
Four as 2 and 2

Ask: “Did the number change?” Then ask: “What did your eyes notice in each arrangement?”

Key idea: moving the same objects changes the arrangement, not how many there are.

Compare after a quick look

Flash a group of 5, then a group of 4. Ask which has more and how the learner knows.

  • Can you make the same number in a different arrangement?
  • If I spread the counters out, does the amount change?
  • Encourage “I saw 5 and 4, so 5 has one more” rather than guessing from spacing.
You doTry it

Quick-look practice

  1. Flash a collection from 1 to 5. Say the total without pointing to every object.
  2. Match two different arrangements that show the same quantity.
  3. Compare two cards and explain which has more, fewer or the same number.
  4. Rearrange the same counters and explain why the total stays the same.
Check understandingQuestions and answers

Question 1

I flash four dots arranged as a square, then cover them. How many?

Answer

4. The learner may recognise the whole square pattern or see 2 and 2.

Question 2

I move the same 5 counters into a new arrangement. Is it still 5? How do you know?

Answer

Yes. No counter was added or removed, so the quantity stayed 5.

Question 3

One learner says “5” after pointing to every dot. Another says “5” after a quick look. Which response demonstrates subitising?

Answer

The quick-look response. Both totals can be correct, but subitising means recognising the quantity without counting each object one by one.

Exit ticketReview and assess
If support is needed
  • If the learner counts every dot, return to familiar patterns of 2 or 3.
  • If rearranging changes the answer, move the same counters while the learner watches.
  • Use dice, domino or five-frame patterns before irregular arrangements.
Exit ticket

Flash a new arrangement of 5 counters for about two seconds.

Cover it. Ask: “How many? What helped you see it?” Then rearrange the same counters and ask again.

Ready to move on when the learner recognises the total across more than one arrangement without relying on one-by-one counting.