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Core concept: Part of a group can be taken away to model subtraction.
Learning Intention:
Learning Intention:
Students are learning that:
Students are learning that:
- quantities can be separated into smaller parts
- subtraction is used to model a story where a part is taken away from a larger quantity
- there are different ways to find the solution to subtraction stories.
Success Criteria:
Success Criteria:
Students can:
Students can:
- take away a smaller part from a whole to solve a subtraction problem
- explain how a solution is found for a subtraction story
- use different ways to find the solution for subtraction stories.
Daily number sense: Number salad – 15 minutes
Daily number sense: Number salad – 15 minutes
Build student understanding of recognising and reading quantities and numerals 13-19 by playing number salad.
Build student understanding of recognising and reading quantities and numerals 13-19 by playing number salad.
Consolidation and meaningful practice: Disappearing items – 15 minutes
Consolidation and meaningful practice: Disappearing items – 15 minutes
Arrange a group of 10 items on a surface. Cover the items and explain that you will briefly show the items and you would like to know how many they see.
Reveal the items for 3 to 4 seconds before covering them again. Ask students to share how many they saw and how they saw them. Select a few students to share what they saw. Reveal the items and check the number of items by counting in unison.
Ask students if there is another way to arrange the collection that would allow us to recognise 10 easily. Invite students to arrange items and explain their reasoning for their ideas.
Cover the items and discreetly remove a few items. Reveal the remaining items and ask students:
How many items are there?
How many disappeared?
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