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Home > Stage 2 > Additive relations > Greedy bird math
Suggested content:
Suggested content:
Recognise and explain the connection between addition and subtraction
Use number relation principles to solve related problems (Reasons about relations)
Demonstrate how addition and subtraction are inverse operations
Use the complement principle of addition and subtraction (Reasons about relations)
Explain and check solutions to problems, including by using the inverse operation
Equipment
Equipment
Bean bags labelled with numbers 1 – 20 (4 sets)
Hoops (1 hoop per group of 3 plus 2 for center ‘nests’)
Chalk, whiteboard and marker or pencil and workbook
Activity set-up
Activity set-up
Teacher sets up 2 games of greedy bird math for a class of 20 – 25 (same as rob the nest).
Evenly spread 5 hoops around a centre hoop (see diagram).
Place 2 sets of numbered bean bags into the centre circle. (bean bags are numbered 1 – 20.
Group students in pairs.
How to play
How to play
One player from each pair runs to the centre circle, collects a bean bag and runs it back to their nest. Partner repeats. Once all bean bags have been retrieved, players begin taking bean bags from other nests. The aim is to collect the most bean bags, before making an addition sentence with their collection.
One player from each pair runs to the centre circle, collects a bean bag and runs it back to their nest. Partner repeats. Once all bean bags have been retrieved, players begin taking bean bags from other nests. The aim is to collect the most bean bags, before making an addition sentence with their collection.
Students stand behind a hoop in group of 2.
On the whistle, one student from each nest will run to the centre circle and collect one bean bag at a time, returning each one back to the nest without dropping or throwing it.
Once all bean bags have been retrieved from the centre, players are then allowed to take bean bags from other nests.
Blow the whistle at a time when all nests have at least 2 bean bags each.
Once the whistle has been blown, students must freeze and then arrange their bean bags to create an addition number sentence, eg. 12 + 5 = 17. Note: bean bags can be grouped to make 2-digit numbers.
Students solve the addition number sentence using an efficient strategy.
Students then demonstrate the inverse operation by creating a subtraction number sentence to prove the accuracy of their addition number sentence, eg. 17 - 12 = 5.
Record both number sentences in maths books.
Once solved, bean bags return to the middle and play resumes on the whistle.
Variations
Variations
Make the largest sum
Make the smallest sum
Make the smallest possible 3 digit number
Make the largest possible 4 digit number
Make a number sentence with an odd number as the answer
Make a number sentence with an even number as the answer
Work with money values.
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