Mental Math and Subitizing

One of the math outcomes I need to cover for my Primary students is:

N02 Students will be expected to recognize, at a glance, and name the quantity represented by familiar arrangements of 1 to 5 objects or dots.

Performance Indicators
N02.01 Look briefly at a given familiar arrangement of 1 to 5 objects or dots and identify the number represented without counting.
N02.02 Identify the number represented by a given dot arrangement on a five-frame.


This outcome works on subitizing.  Subitizing  is the ability to recognize, at a glance, a quantity of objects, without one-to-one counting. I work on this every day with my students during our mental math work.  

I have made dot combination plates on paper that I print out and laminate and I also use PowerPoint presentations.  My students respond in a few ways: with fingers, with number cards I have provided them and/or using a whiteboard to write the number down.  I start off with the lower numbers and work my way up to the larger numbers.  See the pictures to get a better understanding of the PowerPoint.










For each of the files I have, I created 4 different PowerPoint presentations. For example, for the Combinations of 1 to 3 I have 4 different PowerPoint presentations each with 18 slides of various dot combinations of the numbers 1, 2 and 3.  This allows me to show students 4 different presentations and mix it up in mental math.  

I have put this mental math activity in my TPT store that you can find at the following link:



Enjoy!

Kemble :-)



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