Subitizing is the ability to recognize “how many” instantly (without counting). There are two kinds of subitizing:
1. Perceptual Subitizing: Recognizing “how many” without using any mental math processes. E.G., “I see 6”
2. Conceptual Subitizing: Recognizing “how many” by seeing more than 1 quantity and putting them together without counting. E.G., “I see 4 and 5 which is 9”
These cards can be printed out and used in many ways. Here are a few examples:
- As a whole class or small group warm up.
- Take home practice
- Put on binder rings as a math center
- As posters up in the room
- As an exit question for recess, lunch, or home time.