Subitising/ Part-part-wholeWHOLE NUMBERS

Now and Next

Where are they now?

Consistently recognises collections to at least 10 without counting

Where to next?

Recognises 10 of these is 1 of those
(ten as a composite or countable unit via bundling)

Subitises to 20 where there is a clear group of 10.

Purpose

When students associate mental images of dot patterns or collections of objects with numbers (either stated orally or written), they are more likely to understand that maths is about quantities and not just memorising word patterns.

Resources

Activities where students are encouraged to quickly identify collections by making and counting groups of ten help to develop this idea.

 

Linked activitiesLinked Activities

  • download Subitising cards to 20 (video example)
  • download See-Say Bingo ( teens )

AssessmentAssessment

  • download Subitising Probe Task

other resources References to Other Resources

 

 

Activities and Assessments

 

download Subitising Cards

Subitising cards

Focus: Visualise and identify numbers to 20 and beyond as dot patterns or as the total made by groups of dot patterns.

How: Students work in pairs and take turns to flash (show for about two seconds) the cards to each other. A thirty second timer can be used and the total of correct answers recorded (the total number of dots can be written on the back of the card to assist the person flashing). Students try to beat their previous scores. It is important that this is modelled by a teacher with the whole class at regular intervals and that students are given a chance to explain or discuss personal strategies.

Video of Teacher modelling:

video English

video Djambarrpuyŋu

video Kriol

Download subitising cards


download Modified See-Say Bingo ( numbers 10 to 20)

See-Say Bingo 

Focus: Developing automaticity in identifying how many objects are in a collection - up to a total of 20

How: See-Say Bingo instructions

Download Bingo Cards
Download Subitising Cards

download Assessment: Subitising Probe Task

Subitising Probe Task 

Diagnostic assessment task suitible for indiviual students or small groups

Download Subitising Probe task (instructions and BLMs)

Alternate layout for Set 5 (small cards)

 

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