K.2.D Recognize instantly the quantity of a small group of objects in organized and random arrangements
1.2.A Recognize instantly the quantity of structured arrangements
Subitizing allow students to move away from counting by ones to seeing numbers as chunks. For example, in the picture above, eight is seen as a chunk of five (the fingers on one hand) and three more. That’s much quicker than counting each finger. It also leads to a student understanding that 5 + 3 = 8.
So what are organized or structured arrangements? The pips on dice are a great example of an organized or structured arrangement. We instantly recognize the way the numbers look as represented by the pips on a die.
- I counted all the dots.
- I said 5…6, 7, 8
- I know that 5 and 3 is 8
- If all the spaces were full it would be 10, but 2 are empty so it’s 8