Subitising is being able to look at a small set of objects (up to 5) and say how many there are without counting in ones. Once children can count objects reliably we want them to move onto subitising – an important step in the development of number sense.
Perceptual subitising – instantly recognising a small group of objects.
How many Digit Dogs can you see?
Conceptual subitising – seeing smaller groups within a larger group to say how many there are without counting in ones.
I know there are 7 because I see 5 and 2 more.
I know there are 7 because I can see 4 and 3 more.
Show these slides for a couple of seconds to practise subitising. Click once to reveal the image, click again for it to disappear.