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Session 2 Big Ideas

Building a Solid Number FoundationStrategies for Education Assistants

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Mapping Ideas

• Mind Map• Place the topic in the centre (Mathematics Big

Ideas)• Around the topic, write words or phrases that

relate to the main topic (eg: subitizing)• Use colour, graphics, key words to link your

ideas.• http://www.mindmapping.com

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What is number sense?

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Number Sense

• Is the foundation for mathematics

• Is about discovering relationships

• Is exploring and visualizing numbers

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What is REALLY important in numeracy?

• Subitizing• Partitioning• Patterning

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Subitizing

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The BIG ideas:

• Subitizing• Counting tells “how many”• Numbers are related to each other• Number concepts are tied to the real world• Addition and subtraction are related to each

other

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Subitizing

Name each quantity

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Activity

• Using the index cards and the dots on your table, make a “Show Me Quick” dot card.

• Place some of the dots in a random pattern on an index card.

• Keep your dot card number to yourself while making it.

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Eg: What’s missing..?

• Choose a target number• Find two dot cards that can be put together to

make the target number• Place the cards together with the dots facing

up• Pick up one of the cards and ask what card is

missing?

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Table Talk

• How might you use the activity/idea that we just went over with students who you work with?

• Add ideas to your Mind Map

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Partitioning

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Partitioning

• Breaking a set into parts and putting it back together again

• Building an understanding of addition and subtraction

• Allowing students to explore and understand “why” fact families exist

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Activities…

• Two-Part Bags • Story Mats• Make 10…