Hold up three fingers and ask your child how many. If they say “three!” straight away, without counting each finger, they’re subitising. It sounds like a big word for a small thing, but subitising is one of the building blocks of early maths, and it’s in the Prep (Foundation) curriculum. Here’s what subitising is, why it matters, and six quick games to play at home.
What is subitising?
The Victorian Government’s maths-at-home guide puts it simply: “Subitising is the ability to visually recognise how many objects are in a small group without counting. For example, knowing that someone is holding up 3 fingers without counting each finger.”
The Victorian Curriculum’s maths glossary says much the same: subitising is “the capacity to visually recognise the size of a small set of objects without counting.”
You do it all the time. You glance at a die and see five, or look at a plate and know there are three biscuits left. Children aren’t born knowing those patterns. They learn them by seeing small groups again and again, and naming them.
The same guide notes that subitising “usually works best with small numbers – up to 5, and sometimes up to 10.” Bigger groups are where counting, and some clever grouping, take over.
Why is subitising important?
Subitising helps children understand what numbers are, not just how to say them in order. A child who can see that ●●● is three, all at once, is starting to think of three as one amount, a whole.
It also leads straight into adding and taking away. If your child can see five on a ten-frame, and two more beside it, they can know it’s seven without counting from one. The Victorian Curriculum gives that very example for Prep: “It’s 7 because there is 5 there and 2 more.” In Year 1 (Grade 1 at many schools), the same skill turns up in adding strategies, such as seeing that 8 and 6 is the same as 8 and 2 and 4. Our guide to number bonds to 10 picks up from there.
Perceptual and conceptual subitising
Teachers sometimes talk about two kinds of subitising:
- Perceptual subitising is seeing a small amount at a glance: three dots, two ducks, four fingers.
- Conceptual subitising is seeing a bigger amount as smaller parts you already know, and putting them together. Five dots can be seen as three and two; seven might be four and three.
Australia’s National Numeracy Learning Progression, written by ACARA and used across the country, describes both. One of its steps says a child “conceptually subitises a collection up to 5 (e.g. recognises a collection of five items as a result of perceptually subitising smaller parts such as 3 and 2)”. So conceptual subitising grows out of the perceptual kind, and both grow with practice.
Is subitising in the Victorian Prep curriculum?
Yes. The Victorian Curriculum 2.0 names it in Foundation (Prep) maths:
| Code | What children learn |
|---|---|
| VC2MFN02 | “recognise and name the number of objects within a collection up to 5 using subitising” |
| VC2MFN04 | “partition and combine collections up to 10 using part-part-whole relationships and subitising to recognise and name the parts” |
By the end of Prep, children are expected to “use subitising and counting strategies to quantify collections”. Subitising isn’t named again in the Year 1 and Year 2 goals themselves, but it keeps appearing in their examples, as a way to add, share and work with groups. Families in other states will find it in ACARA’s national progression too, so the games below work wherever you live.
What age can children subitise?
There isn’t one fixed age, and children vary a lot. What the curriculum gives is a goal: by the end of Prep, recognising small groups up to 5 at a glance, then using that to see the parts of numbers up to 10. ACARA’s national progression starts with children who subitise “small collections of objects, typically up to 3 items”, and builds from there. If your child counts every dot for a while, that’s normal. Keep playing.
Six quick subitising games for home
Each game takes a few minutes. The Department’s advice is a good rule for all of them: “Encourage your child to subitise first, then check by counting.”
- Dice flash. Roll one die and cover it with your hand. Lift your hand for a second, then cover it again. “How many dots?” Check by counting together. Start with 1 to 3, then the whole die.
- Domino match. Spread out some dominoes. Call a number, and your child finds a half with that many dots as fast as they can. Later, ask how many dots on both halves.
- How many fingers? Hold up some fingers for a moment, then hide your hands. Swap roles so your child flashes fingers for you. Try the same amount different ways: three can be one hand, or two on one hand and one on the other.
- Ten-frame peek. Draw a ten-frame (two rows of five boxes) on paper and put pasta or buttons in some boxes. Show it for two seconds. “How many? How do you know?” Answers like “five on top and two more” are exactly right.
- Egg carton quick look. Put a few pom-poms in an egg carton, open the lid for a moment and close it. Later, ask “How many empty?” as well as “How many full?”
- Dot cards. Draw dots on small cards: in dice patterns at first, then in a line, then scattered. Flash a card and say the number. Scattered dots are harder, which makes a good challenge.
If your child counts instead
That’s fine. Counting is a skill too, and many children count first, then start to “just know” smaller groups. A few things help:
- Go smaller. Stick to 1, 2 and 3 until they come quickly.
- Use familiar patterns. Dice and domino dots are easier than scattered ones.
- Name it together. “That’s three. One, two, three, yes! Three.”
- Make it everyday. Two shoes, three apples, four wheels on the car. The more often amounts are named, the faster they’re seen.
For more everyday number games, see our post on everyday maths talk, which includes quick looks in the car and the kitchen. Subitising is also one of the early number skills in Victoria’s new Year 1 Numeracy Check.
Questions parents ask
What is subitising?
Subitising is seeing how many things are in a small group without counting them, like knowing that someone is holding up three fingers at a glance. It usually works best with small numbers, up to 5 and sometimes up to 10.
Why is subitising important?
It helps children understand numbers as amounts, and it leads into adding and taking away. A child who can see five and two more on a ten-frame can know it’s seven without counting from one.
What age can children subitise?
There’s no fixed age. The Victorian Curriculum expects children to recognise small groups up to 5 using subitising by the end of Prep, and to use it to see the parts of numbers up to 10.
What is the difference between perceptual and conceptual subitising?
Perceptual subitising is seeing a small amount at once, like three dots. Conceptual subitising is seeing a bigger amount as smaller known parts, like seeing five as three and two, and putting them together.
How do I teach subitising at home?
Flash small groups for a second or two and ask how many: dice, dominoes, fingers, a ten-frame or an egg carton. Let your child subitise first, then check by counting together.
Is subitising in the Victorian Prep curriculum?
Yes. Foundation (Prep) maths includes VC2MFN02, recognising collections up to 5 using subitising, and VC2MFN04, using subitising to name the parts of collections up to 10.
Sources
- Mathematics and numeracy at home, Victorian Government
- Victorian Curriculum F–10 Version 2.0: Mathematics, VCAA (VC2MFN02, VC2MFN04 and the Foundation achievement standard)
- Mathematics glossary, VCAA
- National Numeracy Learning Progression, Version 3 (comparative document), ACARA
