Builds alongside
Subitising and counting develop together in Foundation and support each other.
Show a young child two dots and ask how many. They will say “two” instantly, without counting. Show them three, and most will still answer at once. This instant knowing — recognising how many are in a small group without counting them one by one — is called subitising, and it is the focus of this part of Foundation. It might seem like a small skill next to counting, but it is one of the deepest foundations of number sense, and children who subitise well find almost everything in later mathematics easier.
Flash and tell
Press Flash. The dots appear for just a moment, then vanish. Ask the child how many they saw — before they can count. That instant knowing is subitising. Then press Show the answer to check together.
It is not counting
Subitising is genuinely different from counting. When a child counts, they point and say a number name for each object in turn, and the last number is the answer. Subitising skips all of that. The child simply sees the group and knows the amount, the way you instantly recognise a pattern on a dice without counting the pips. Counting is one-at-a-time and deliberate; subitising is all-at-once and immediate. Both matter, and they support each other, but they are not the same thing.
Dice patterns
Dice and dominoes use the same patterns over and over, so children learn to know each face at a glance — without counting the dots. These familiar arrangements are the best starting point for subitising.
Two kinds of subitising
Knowing the difference helps you teach it. Perceptual subitising is the instant recognition of very small groups — usually one, two, three and often four objects. A child sees three counters and just knows it is three, with no strategy at all. This is the bedrock, present very early. Conceptual subitising is recognising a larger group by instantly seeing it as smaller groups put together. A child who looks at the six on a dice and sees “three and three” is conceptually subitising — not counting all six, but combining two familiar threes. This is the bridge to working with larger numbers, and it quietly prepares a child for addition.
See the parts inside
Bigger groups are easier to know when you see them as smaller parts. The six on a dice is “three and three”; five is “three and two”. A child who sees the parts is quietly getting ready for addition.
The arrangement matters
The same five objects are far easier to recognise instantly when they are in a familiar pattern, like the five on a dice, than when they are scattered randomly. This is why dice faces, dominoes, ten-frames and fingers are such powerful tools — their patterns are regular and repeated, so a child meets the same arrangements again and again and learns each one in a single glance. At the same time, a child should learn that the amount does not change when you move the objects: four is four, however it is placed.
Four is four
The same four dots, placed differently each time. A child learns that the amount does not change when you move the objects around — four is four, whether it is a square, a row or a diamond. This is a surprisingly important idea.
Show it on fingers
Fingers are the pattern a child always has with them. Held up together, they make a quick, familiar way to show and recognise small numbers — and five fingers gives a natural anchor for the number five.
Why it matters so much
Subitising is not just a party trick. It gives a child a felt sense of quantity — an anchor that numbers attach to. A child who can instantly see four and six can later understand that six is two more than four without laboriously counting. They can check whether a count “looks right”. They build the small number facts, like seeing that three and two make five, that addition and subtraction are built from. Without this felt sense, later arithmetic becomes a fragile process of counting on fingers with no understanding underneath. With it, the numbers mean something.
Flash game
A quick game for the child. Watch the flash, then tap how many dots you saw. The dots show only for a moment, so there is no time to count — just see and know. Nothing is saved.
How to use these with a child
Flash a pattern for just a moment, then hide it and ask how many. The brief flash is important: it stops the child from counting and forces the instant recognition that is the whole point. Use dice and domino patterns often, because they are familiar and regular. Show the same amount in different arrangements so the child learns that four is four however it is placed. Encourage them to see bigger groups as smaller parts: “I see three and three, that is six”. And as always at this age, keep it short, warm and playful. A quick flashing game a few times a day does far more than a long sitting.