Subitizing is the instant recognition of the total number of objects in an image. Early in mathematics, children use perceptual subitizing to identify quantity – think about dots on dice. When you see the three, you don’t count one-two-three, you know it’s three.
Later, children use conceptual subitizing to identify quantity as units of units. That is, they see the seven as three-one-three (or three-three-one).
Read more about subitizing in this article by NCTM: Subitizing: What is it? Why Teach it?
So, in my pursuit to challenge myself technologically and utilize some great tools from Apple, I created this video below. Note: again, I restricted myself to one hour for this work.